It's like a 2D version of Portal 2 (or Tag: The Power of Paint). Pretty cool, though, since these mechanics seem like they would take a while to code. I feel like the one color limit though didn't matter too much, since it seems like you really only ever had to use one at a time to solve each puzzle.
Can you jump up the wall to the left? I spent my first two minutes trying to do that (without even going right). It might have been cool if there was a secret over there and you used to green to get over there once you figured out what it does.
Obviously you're time limited so you didn't have enough time to make puzzles that combine the elements, but I would have liked to have some puzzles with the green color since that was an interesting idea and its only function it appeared to serve seemed to be the a-ha moment when you found out what it finally does.