Like the game play, simple but satisfying. Grafic design really nice, love these obstacles which look like faces. I Also love the rotating bit and the colour change.
Not sure where is the EVOLVE theme. Also it would be useful if you would explain how you play the game. Even simple "Press space to move in opposite direction" would be enough. Also allow the player to restart the game without using mouse, because it can be annoying. And at last adding some particle effects to the player would really add a lot of juice and feel to this game(sound effects also would be appreciate). And I also used a lot of "also".