Nice game! I really liked the music being synced up to the gameplay. It builds tension and motivates you to keep playing.
One suggestion I would have is adding some kind of feedback when you hit enemies with more than 1 hp(just playing a sound would be fine). It took me a while to figure that I just have to hit the ramming enemy twice. At first I assumed I have to hit him when he hit a wall and is paralyzed and got killed alot of times.