Fix bugs found during testing

src/js/states/main_menu.js

@@ -92,7 +92,7 @@ export class MainMenuState extends GameState {
                 </div>
 
                 ${
-                    G_IS_STANDALONE && puzzleDlc
+                    (G_IS_STANDALONE && puzzleDlc) || G_IS_DEV
                         ? `
                     <div class="puzzleContainer">
                         <img class="dlcLogo" src="${cachebust(

src/js/states/puzzle_menu.js

@@ -6,6 +6,7 @@ import { TextualGameState } from "../core/textual_game_state";
 import { formatBigNumberFull } from "../core/utils";
 import { enumGameModeIds } from "../game/game_mode";
 import { ShapeDefinition } from "../game/shape_definition";
+import { MUSIC } from "../platform/sound";
 import { Savegame } from "../savegame/savegame";
 import { T } from "../translations";
 
@@ -59,6 +60,10 @@ export class PuzzleMenuState extends TextualGameState {
         this.activeCategory = "";
     }
 
+    getThemeMusic() {
+        return MUSIC.puzzle;
+    }
+
     getStateHeaderTitle() {
         return T.puzzleMenu.title;
     }