This is very nice! Such a friendly & approachable way to play Sokoban. I do think though that it would be considerate to credit the authors of the included level packs in the menu (or at least in the credits).
Ooh, good point. Most of the level files themselves include that information, but it’s not surfaced well in-game. My parser is a bit lazy but I could try to intentionally pull out “frontmatter” from level packs when it exists, and failing that, I can add entries to the credits specifically for the packs I include, manually. Thanks for the feedback!