Nice little platformer game. The character controls were nice and tight, though I did notice that if you jump off of a moving platform you an extra boost from the platform's velocity. That could be a feature, but I wasn't sure if it was intended or not.
The main critique I have is that I couldn't figure out how to get onto the pillar with the last yellow button before the falling spheres. I probably missed something, but I thought I pressed all the other buttons in the scene so I wasn't sure what else to do.