Great!
This game was excellent! While the graphics may make it look at first glance like it will be an amateur effort, the game itself proves that wrong quickly. The gameplay is very smooth, and very fun, and the level design is some of the best I've ever seen. The difficulty curve is just about perfect, as well. I had to play through the whole thing, then do the challenges as well (level 18's nasty). Very good job!
Rather than have us wait for a sequel, you could just make some extra levels.