I really liked the visuals and the audio, and the concept of racing against the sun was great, especially since you can see the sun setting in the background. I agree with the other commentors that the controls made it harder to complete the levels; personally I think implementing coyote time (allowing the player a few extra moments after leaving the ground to jump) would on its own alleviate a lot of my control problems.
I managed to beat level 1 with less than a second to spare, but could not get past the bridge on level 2. Both levels seemed cool though!