Wow, crazy game! cool graphics and music! I think that sometimes the guns are a bit too loud and it's hard to hear the boss music. The 10 seconds theme is implemented really well, and stacking up power ups gives a powerful feeling I really liked this concept! However, it does make the game a bit too easy when you stack up a lot of powerups so maybe restricting some of it? I dunno.
Overall, I had a lot of fun playing the game and it looks really great!