Thank you for your feedback and your honest opinion! Yes, chess-like non-chess puzzles seem to be quite a niche. And it's hard to find an audience with the sheer number of new games.
Great suggestions for the sound. Thanks for sharing your ideas! I did look for sounds in the community assets but most sounded too futuristic for this game's theme, I thought. I'll have another look. Music and button will be in the next update. 👍