I found this game to be good. What I did not like about it was that it was basically the same enemies over and over. I really liked the menu. It's one of the most unique I've ever seen! I am still glad that's not what the game was itself like. You really could rapidly fire in this.
It was just fun to have so many different songs. That's quite a lot for a game that doesn't have that much difference in the levels. The pause music is probably the best. You also have a pretty cool title going for you. It is worth looking at.