Ok, so I think this could be a relaxing endless-game but the checkered pattern makes my eyes hurt so much :( Still, a game in 3 hrs and even 3D is pretty cool.
Some ideas for improvement: the player can see the obstacles and powerups being spawned in, maybe add a fog at the end or have them fall down (physics?) from somewhere, also adds some randomness. Some of the powerups where impossible to get without running into a wall.
Maybe add speed over time (or if it already does, maybe accelerate it, I couldn't play very long because of the pattern).