I'm not a fan of the genre, but I'll admit I had fun, I think the difficulty of the obstacles is very well paced for casual runners like me ; unlike other die and retry entries, going back to the start wasn't so frustrating (perhaps because the music you picked is groovy ! likely also because I could enjoy seeing that I passed the beginning more and more easily). For now I'll be satisfied with my highscore of 8300 ^^"
It is however a bit hard to enjoy the nice landscape while running ; I would advise putting more artistic effort into the foreground, where we actually need to focus our attention. I would also recommend picking significantly distinct colors for the background, it wasn't really an issue (well, not at all in the world with the black foreground), but it's a generally good rule for clarity. A difference in value/luminance is a wise choice since the colorblind will perceive it.