This is a really fun concept with some nice and simple art. I think the controls feel a bit unnatural but it also seems like that's the point. There were some times where I wasn't targeted for up to 5 waves at a time, so I think the balancing needs some work. I got to level 5 without taking a hit and got hit 3 times right after. Regardless of the balancing issues, this is really nice, good work!