Way, way, waaaaay too easy. I stopped playing at score 12000 out of sheer boredom, it seemed that the game would never get difficult. Felt more like a marathon than anything speedy.
While it's ok to start off easy, each "speed up" should increase the speed much more, so that more advanced players don't have to wait 15 minutes for the game to get challenging.
Other than that: great visuals; nice music and audio effects; gameplay could use some more elements (such as moving walls, click to jump over walls, etc.)