Fun game and fun concept! I really liked the music and it was fun to have to manage your abilities. I would suggest adding some more powerful enemies with different playstyles, like archers that shoot at the crystal from afar and try to avoid you. Having a vampire survivors like level up and upgrade system could also do a lot to spice up gameplay, as it would allow you to make the game more difficult and make the player more powerful as the game progresses. Great job overall!