Sound for electron app?

I’m trying to create my first snap for an electron app. The app works, but without sound. What am I missing? This is my snapcraft.yaml

name: tateti
base: core24
version: '1.0.0'
summary: Danielle's Ta-Te-Ti – a beautiful tic-tac-toe game
description: |
  Danielle's Ta-Te-Ti is a modern take on the classic tic-tac-toe game.
  It supports local play, AI opponents, WebRTC multiplayer, and a unique
  3-piece variant.

grade: stable
confinement: strict

platforms:
  amd64:
  arm64:

apps:
  tateti:
    command: bin/tateti
    desktop: meta/gui/tateti.desktop
    environment:
      DISABLE_WAYLAND: 1
      ELECTRON_IS_SNAP: 1
      GTK_MODULES: canberra-gtk3-module   # loads libcanberra for sounds
    plugs:
      - home
      - network
      - network-bind
      - audio-playback
      - desktop
      - desktop-legacy
      - wayland
      - x11
      - unity7
      - opengl
      - browser-support
      - gsettings
      - pulseaudio

layout:
  /usr/share/libdrm:
    bind: $SNAP/usr/share/libdrm
  /usr/lib/$CRAFT_ARCH_TRIPLET/dri:
    bind: $SNAP/usr/lib/$CRAFT_ARCH_TRIPLET/dri

parts:
  tateti:
    plugin: dump
    source: ./dist-electron/linux-unpacked
    stage-packages:
      - libnss3
      - libnspr4
      - libatk1.0-0
      - libatk-bridge2.0-0
      - libcups2
      - libgtk-3-0
      - libpango-1.0-0
      - libcairo2
      - libatspi2.0-0
      - libgdk-pixbuf2.0-0
      - libdrm2
      - libxss1
      - libxcomposite1
      - libxcursor1
      - libxi6
      - libxtst6
      - libxrandr2
      - libasound2
      - libgbm1
      - libxkbcommon0
      - libxdamage1
      - libxfixes3
      - fonts-liberation
      - libappindicator3-1
      - libdbusmenu-glib4
      - libdbusmenu-gtk3-4
      - libindicator3-7
      - libsecret-1-0
      - libnotify4
      - libvulkan1
      - libcanberra-gtk3-module   # ← sound plug-in, will prune OSS below
    override-build: |
      craftctl default

      # 1. Remove the OSS backend that drags in libOSSlib.so
      find $CRAFT_PART_INSTALL -name 'libcanberra-oss.so' -delete

      # 2. Make Electron binary executable
      chmod +x $CRAFT_PART_INSTALL/tateti-deluxe

      # 3. Wrapper script
      mkdir -p $CRAFT_PART_INSTALL/bin
      cat > $CRAFT_PART_INSTALL/bin/tateti << 'EOF'
      #!/bin/sh
      exec "$SNAP/tateti-deluxe" --no-sandbox --disable-gpu-sandbox --use-gl=desktop "$@"
      EOF
      chmod +x $CRAFT_PART_INSTALL/bin/tateti

      # 4. Desktop entry
      mkdir -p $CRAFT_PART_INSTALL/meta/gui
      cat > $CRAFT_PART_INSTALL/meta/gui/tateti.desktop << 'EOF'
      [Desktop Entry]
      Version=1.0
      Type=Application
      Name=Ta-Te-Ti
      GenericName=Tic-Tac-Toe Game
      Comment=Play Danielle's tic-tac-toe with friends
      Exec=tateti %U
      Icon=${SNAP}/meta/gui/icon.png
      Terminal=false
      StartupNotify=true
      Categories=Game;BoardGame;
      Keywords=tic-tac-toe;game;multiplayer;board;strategy;
      StartupWMClass=tateti-deluxe
      EOF

      # 5. Icon
      if [ -f "$CRAFT_PROJECT_DIR/icons/icon-512.png" ]; then
        cp "$CRAFT_PROJECT_DIR/icons/icon-512.png" \
           $CRAFT_PART_INSTALL/meta/gui/icon.png
      fi

And this is what i see on the console when i launch the game:

tateti 
Gtk-Message: 17:41:25.604: Failed to load module "canberra-gtk3-module"
Gtk-Message: 17:41:25.665: Failed to load module "canberra-gtk-module"
Gtk-Message: 17:41:25.666: Failed to load module "canberra-gtk-module"

(tateti-deluxe:1089961): GLib-GIO-CRITICAL **: 17:41:25.681: g_settings_schema_source_lookup: assertion 'source != NULL' failed

(tateti-deluxe:1089961): GLib-GIO-CRITICAL **: 17:41:25.727: g_settings_schema_source_lookup: assertion 'source != NULL' failed
[1090031:0615/174125.745391:ERROR:gl_factory.cc(113)] Requested GL implementation (gl=none,angle=none) not found in allowed implementations: [(gl=egl-angle,angle=default)].
[1090031:0615/174125.746458:ERROR:viz_main_impl.cc(166)] Exiting GPU process due to errors during initialization
[1090104:0615/174125.872214:ERROR:gl_factory.cc(113)] Requested GL implementation (gl=none,angle=none) not found in allowed implementations: [(gl=egl-angle,angle=default)].
[1090104:0615/174125.873285:ERROR:viz_main_impl.cc(166)] Exiting GPU process due to errors during initialization
[1089961:0615/174126.201523:ERROR:object_proxy.cc(576)] Failed to call method: org.gnome.SessionManager.Inhibit: object_path= /org/gnome/SessionManager: org.freedesktop.DBus.Error.AccessDenied: An AppArmor policy prevents this sender from sending this message to this recipient; type="method_call", sender=":1.10467" (uid=1000 pid=1089961 comm="/snap/tateti/x10/tateti-deluxe --no-sandbox --disa" label="snap.tateti.tateti (enforce)") interface="org.gnome.SessionManager" member="Inhibit" error name="(unset)" requested_reply="0" destination="org.gnome.SessionManager" (uid=1000 pid=6940 comm="/usr/libexec/gnome-session-binary --systemd-servic" label="unconfined")
[1089961:0615/174126.201539:ERROR:power_save_blocker_linux.cc(344)] No response to Inhibit() request!

Thanks for the help!