This game had great music and good graphics. The gameplay was interesting too. The achievements for kills felt a little judgy. :)
It would have been nice to have controller support, and adding it would have taken about 5-10 minutes.. Keyboard controls hurt my hand. It also would've been nice for a full screen option. You can enable this now by editing the game page and enabling full screen in the options. (You are allowed to edit the itch page after the jam is complete.) Sound effects would also have made the game come alive.
Overall this is a good start to a game that looks and sounds good.