Now, here's the thing. I really don't have that much to complain about, because it pretty much is a nicely put together game. What I didn't like was how it just seemed to get too redundant. It took too long to get any medals at all. I know that's kind of a shallow thing to say, but it's how I felt. The sound effects were pretty good, though. It's one of those things where it gets tiring as it goes on.
I got used to most of the sound effects. I didn't know that you lost the level when the timer ran out. I thought that was just for extra points. You probably shouldn't have made every monster look the same. It's still a harmless game.