Really fun game! I included it in part 24 of my Cyberpunk Jam compilation video series, if you want to take a look :) http://youtu.be/-hima5IUmBU

The controls are twitchy, in an annoying way. Every time you press an arrow key, you had to press the opposite to straighten out again - maybe that's what you were going for, but it could feel smoother. Up and down was fine.
The track felt much too long, especially as neither the layout, visuals or music changed (except for the totally out of place dog bark about half way through -what). I didn't try endless for this reason. It could really benefit from a sense of progression by changing these things the further you get, or getting faster, as others have suggested. 

The race took way too long, in my opinion. Typically when you fall, you accelerate too.

Quite cool but would like the speed to keep going faster and faster.

Slow racing??  I wanna race quickly!