Played it up until wave 23, then the game crashed (memory access out of bounds). Overall you nailed the juiciness of the game (visual and audio). I didn't find the game challenging, once you get the lifesteal with the beam you essentially can't die. The first few level are pretty fast, almost too fast. I felt like I didn't had the time to enjoy my new skill that I the game was paused and I had to chose something.
Congrats and thank you for making something that fun to play.