This is a really awesome idea. The last two levels bugged out for me so I wasn't able to move, but apart from that it was great.
Things to improve: Game juice. The screen shake when enemies die is nice, but not enough. More music (maybe different themes for pawn/knight/bishop), more sound effect, more particles.
Other than that, this is a really impressive game to finish in 48 hours. Well done! I'd like to play more of this.