diff --git a/spx-gui/src/components/editor/sprite/animation/AnimationPlayer.vue b/spx-gui/src/components/editor/sprite/animation/AnimationPlayer.vue
index 4940cbb97..5fbb82eb9 100644
--- a/spx-gui/src/components/editor/sprite/animation/AnimationPlayer.vue
+++ b/spx-gui/src/components/editor/sprite/animation/AnimationPlayer.vue
@@ -7,7 +7,7 @@
 </template>
 <script setup lang="ts">
 import { computed, ref, watch } from 'vue'
-import { Disposable } from '@/models/common/disposable'
+import { Disposable } from '@/utils/disposable'
 import { useFileUrl } from '@/utils/file'
 import type { File } from '@/models/common/file'
 import type { Costume } from '@/models/costume'
diff --git a/spx-gui/src/components/ui/block-items/UIBlockItem.vue b/spx-gui/src/components/ui/block-items/UIBlockItem.vue
index 7dee17818..f13aefbf9 100644
--- a/spx-gui/src/components/ui/block-items/UIBlockItem.vue
+++ b/spx-gui/src/components/ui/block-items/UIBlockItem.vue
@@ -19,7 +19,7 @@ import type { Color } from '..'
 const props = withDefaults(
   defineProps<{
     active?: boolean
-    color: Color
+    color?: Color
     variant?: 'standard' | 'colorful'
     size?: 'medium' | 'large'
   }>(),
diff --git a/spx-gui/src/models/animation.ts b/spx-gui/src/models/animation.ts
index 0eb2b0e1f..a659ce262 100644
--- a/spx-gui/src/models/animation.ts
+++ b/spx-gui/src/models/animation.ts
@@ -1,11 +1,11 @@
 import { reactive } from 'vue'
 
+import { Disposable } from '@/utils/disposable'
 import {
   ensureValidCostumeName,
   getAnimationName,
   validateAnimationName
 } from './common/asset-name'
-import { Disposable } from './common/disposable'
 import type { Files } from './common/file'
 import type { Costume, RawCostumeConfig } from './costume'
 import type { Sprite } from './sprite'
diff --git a/spx-gui/src/models/common/file.ts b/spx-gui/src/models/common/file.ts
index 6e150eabe..feb23fce8 100644
--- a/spx-gui/src/models/common/file.ts
+++ b/spx-gui/src/models/common/file.ts
@@ -7,7 +7,7 @@
 import { markRaw } from 'vue'
 import { getMimeFromExt } from '@/utils/file'
 import { extname } from '@/utils/path'
-import type { Disposer } from './disposable'
+import type { Disposer } from '@/utils/disposable'
 import { Cancelled } from '@/utils/exception'
 
 export type Options = {
diff --git a/spx-gui/src/models/costume.ts b/spx-gui/src/models/costume.ts
index cfd2ac300..5bd25b8bc 100644
--- a/spx-gui/src/models/costume.ts
+++ b/spx-gui/src/models/costume.ts
@@ -2,11 +2,11 @@ import { reactive } from 'vue'
 
 import { extname, resolve } from '@/utils/path'
 import { adaptImg } from '@/utils/spx'
+import { Disposable } from '@/utils/disposable'
 import { File, type Files } from './common/file'
 import { type Size } from './common'
 import type { Sprite } from './sprite'
 import { getCostumeName, validateCostumeName } from './common/asset-name'
-import { Disposable } from './common/disposable'
 import { Animation } from './animation'
 
 export type CostumeInits = {
diff --git a/spx-gui/src/models/project/index.test.ts b/spx-gui/src/models/project/index.test.ts
new file mode 100644
index 000000000..4605e3942
--- /dev/null
+++ b/spx-gui/src/models/project/index.test.ts
@@ -0,0 +1,38 @@
+import { describe, it, expect } from 'vitest'
+import { Sprite } from '../sprite'
+import { Animation } from '../animation'
+import { Sound } from '../sound'
+import { Costume } from '../costume'
+import { fromText } from '../common/file'
+import { Project } from '.'
+
+function mockFile(name = 'mocked') {
+  return fromText(name, Math.random() + '')
+}
+
+function makeProject() {
+  const project = new Project()
+  const sprite = new Sprite('Sprite')
+  const costume = new Costume('default', mockFile())
+  sprite.addCostume(costume)
+  const animationCostumes = Array.from({ length: 3 }, (_, i) => new Costume(`a${i}`, mockFile()))
+  const animation = Animation.create('default', animationCostumes)
+  sprite.addAnimation(animation)
+  const sound = new Sound('sound', mockFile())
+  project.addSprite(sprite)
+  project.addSound(sound)
+  return project
+}
+
+describe('Project', () => {
+  it('should preserve animation sound with exportGameFiles & loadGameFiles', async () => {
+    const project = makeProject()
+    const sprite = project.sprites[0]
+    const animation = sprite.animations[0]
+    animation.setSound(project.sounds[0].name)
+
+    const files = project.exportGameFiles()
+    await project.loadGameFiles(files)
+    expect(project.sprites[0].animations[0].sound).toBe(project.sounds[0].name)
+  })
+})
diff --git a/spx-gui/src/models/project/index.ts b/spx-gui/src/models/project/index.ts
index 2a5399ec8..776b57e60 100644
--- a/spx-gui/src/models/project/index.ts
+++ b/spx-gui/src/models/project/index.ts
@@ -7,8 +7,8 @@ import { reactive, watch } from 'vue'
 
 import { join } from '@/utils/path'
 import { debounce } from '@/utils/utils'
+import { Disposable } from '@/utils/disposable'
 import { IsPublic, type ProjectData } from '@/apis/project'
-import { Disposable } from '../common/disposable'
 import { toConfig, type Files, fromConfig } from '../common/file'
 import { Stage, type RawStageConfig } from '../stage'
 import { Sprite } from '../sprite'
@@ -101,6 +101,7 @@ export class Project extends Disposable {
   removeSprite(name: string) {
     const idx = this.sprites.findIndex((s) => s.name === name)
     const [sprite] = this.sprites.splice(idx, 1)
+    this.zorder = this.zorder.filter((v) => v !== sprite.name)
     sprite.dispose()
     this.autoSelect()
   }
@@ -129,9 +130,6 @@ export class Project extends Disposable {
         }
       )
     )
-    sprite.addDisposer(() => {
-      this.zorder = this.zorder.filter((v) => v !== sprite.name)
-    })
   }
   private setSpriteZorderIdx(
     name: string,
@@ -160,6 +158,14 @@ export class Project extends Disposable {
   removeSound(name: string) {
     const idx = this.sounds.findIndex((s) => s.name === name)
     const [sound] = this.sounds.splice(idx, 1)
+    // TODO: it may be better to do `setSound(null)` in `Animation`, but for now it is difficult for `Animation` to know when sound is removed
+    for (const sprite of this.sprites) {
+      for (const animation of sprite.animations) {
+        if (animation.sound === sound.name) {
+          animation.setSound(null)
+        }
+      }
+    }
     sound.dispose()
     this.autoSelect()
   }
@@ -192,16 +198,6 @@ export class Project extends Disposable {
         }
       )
     )
-    sound.addDisposer(() => {
-      // TODO: it may be better to do `setSound(null)` in `Animation`, but for now it is difficult for `Animation` to know when sound is removed
-      for (const sprite of this.sprites) {
-        for (const animation of sprite.animations) {
-          if (animation.sound === sound.name) {
-            animation.setSound(null)
-          }
-        }
-      }
-    })
   }
 
   setPublic(isPublic: IsPublic) {
diff --git a/spx-gui/src/models/sound.ts b/spx-gui/src/models/sound.ts
index a7229db61..822b114b2 100644
--- a/spx-gui/src/models/sound.ts
+++ b/spx-gui/src/models/sound.ts
@@ -1,7 +1,7 @@
 import { reactive } from 'vue'
 import { extname, join, resolve } from '@/utils/path'
 import { adaptAudio } from '@/utils/spx'
-import { Disposable } from './common/disposable'
+import { Disposable } from '@/utils/disposable'
 import { File, fromConfig, type Files, listDirs, toConfig } from './common/file'
 import { getSoundName, validateSoundName } from './common/asset-name'
 import type { Project } from './project'
diff --git a/spx-gui/src/models/sprite.ts b/spx-gui/src/models/sprite.ts
index a3184b9ed..51ffc2438 100644
--- a/spx-gui/src/models/sprite.ts
+++ b/spx-gui/src/models/sprite.ts
@@ -6,8 +6,8 @@
 import { reactive, watch } from 'vue'
 import { nomalizeDegree } from '@/utils/utils'
 import { join } from '@/utils/path'
+import { Disposable } from '@/utils/disposable'
 import { fromText, type Files, fromConfig, toText, toConfig, listDirs } from './common/file'
-import { Disposable } from './common/disposable'
 import {
   ensureValidAnimationName,
   ensureValidCostumeName,
@@ -134,6 +134,9 @@ export class Sprite extends Disposable {
     const idx = this.animations.findIndex((s) => s.name === name)
     if (idx === -1) throw new Error(`animation ${name} not found`)
     const [animation] = this.animations.splice(idx, 1)
+    Object.entries(this.animationBindings).forEach(([state, name]) => {
+      if (name === animation.name) this.animationBindings[state as State] = undefined
+    })
     animation.setSprite(null)
     animation.dispose()
   }
@@ -145,7 +148,6 @@ export class Sprite extends Disposable {
     const newAnimationName = ensureValidAnimationName(animation.name, this)
     animation.setName(newAnimationName)
     animation.setSprite(this)
-    animation.addDisposer(() => animation.setSprite(null))
     this.animations.push(animation)
     animation.addDisposer(
       // update animationBindings when sprite renamed
@@ -158,11 +160,6 @@ export class Sprite extends Disposable {
         }
       )
     )
-    animation.addDisposer(() => {
-      Object.entries(this.animationBindings).forEach(([state, name]) => {
-        if (name === animation.name) this.animationBindings[state as State] = undefined
-      })
-    })
   }
 
   private animationBindings: Record<State, string | undefined>
@@ -226,6 +223,9 @@ export class Sprite extends Disposable {
     this.code = code
     this.costumes = []
     this.animations = []
+    this.addDisposer(() => {
+      this.animations.splice(0).forEach((a) => a.dispose())
+    })
     this.animationBindings = {
       [State.default]: inits?.defaultAnimation,
       [State.die]: inits?.animBindings?.[State.die],
diff --git a/spx-gui/src/models/common/disposable.ts b/spx-gui/src/utils/disposable.ts
similarity index 100%
rename from spx-gui/src/models/common/disposable.ts
rename to spx-gui/src/utils/disposable.ts
diff --git a/spx-gui/src/utils/img.ts b/spx-gui/src/utils/img.ts
index 007c33a9e..688d81b35 100644
--- a/spx-gui/src/utils/img.ts
+++ b/spx-gui/src/utils/img.ts
@@ -1,4 +1,4 @@
-import { Disposable } from '@/models/common/disposable'
+import { Disposable } from '@/utils/disposable'
 
 /** Convert arbitrary-type (supported by current browser) image content to type-`image/jpeg` content. */
 export async function toJpeg(blob: Blob) {