Good main mechanic. I also liked the overall feeling of the game. For me all 4 levels were exactly the same, is that on purpose? I also felt like the music is very low quality or fidelity, my ears hurt a bit from the low bitrate distortion (or maybe it was an effect idk). I think this prototype is pretty good and it has a lot of potential to grow (different chess pieces, or different boards, special squares etc), and it would be fun to play against other players too :)