So, this is a pretty cool project! I really liked the concept. Couple notes, the beam, because it's just a continuous swirl pattern, it looks like it's moving when it's stationary, I my brain kept correcting it back... Not a big deal but a little confusing at first. I think, the difficulty is appropriate, maybe a little high tuned on the shorter passages, seems like it would be pretty hard to continue without ever losing a life... The positions of the players sorta effects the area they can effect but some aliens seemed to move outside the area that any could, so that was a bit frustrating as well.
Overall, pretty well polished and good music!
Great work!