I didn't really care for this game. While it wasn't terrible, there was a big feeling that it appeared to be lacking something. It's just that the graphics did not seem to be well made. Everything was just made of simple lines and stuff. I will say that I like the sound effects. What I also don't like is why you even have those little blue bullets when they never destroy an enemy.
I guess it just comes off as a bit bland that way. I think the bombs are pretty cool weapons, but why not make them the primary weapon? The music isn't bad, it seems to give off a nice technical sense of the game. I just suggest that you put more detail and more creative gameplay into this. At least it's already quite popular.