I wasn't really sure what I had to do and found myself walking around the levels pressing 'c' at anything I could find.
I think you need to give the player a simple first level which instructs them on exactly what they need to do and how.
Nice sound and graphics fitted well, speed of movement was good, so I did not get frustrated being in the wrong part of the level.
If you took it further I would think about adding some jeopardy to the levels.
well done.