Thanks for the feedback!
Uncovering areas of the screen with your glowing bullets was one of the first ideas I had for the game and maybe my favorite, so I'm glad you like it :) I actually only managed to beat the final wave once myself, gotta go for +bullets and +firerate mainly.
And yeah, since I'm a musician as well I really wanted to compose the soundtrack myself. But when I realized that I wouldn't have sufficient time to do that it also didn't feel right to just add some free music to it. So now there's just no audio which sucks. But next time I'll make sure to take care of that sonner.
Thanks again^^