Hrmm..
Hey man, thanks for using my audio, even if it is super low quality :D.
Okay, now, the game. It was moderately challenging and I see you tried to aim the last levels for a REAL challenge, but I think it didn't come out as hard as you probably wanted. It's need to be harder! And more levels..Maybe spikes that shoot from the edges, or timed flame spouts, or maybe a monster-type thing that chases the dot and if he catches you before you finish, you lose :D
Hope those ideas will help you. The levels, although not too hard, were fun.
The first background made my comp lag a lot, even on low quality, but the second and third were fine. I have a beefy comp btw ;)