It may be a simple concept, but well executed. Love the gameboy aesthetic to the game as well, both visually and sounds.
How much testing have you done on balance? Having a smaller board means everything becomes a lot closer, and I wonder how that impacts the game compared to regular chess. I think spinning makes knights very powerful as one can spin an otherwise non-connected tile in range of a knight if you’re not careful.
May have another go of this with some friends and see if we can have a proper few games to see what it’s like.