This game's atmosphere is so nice and tranquil (at least until the monsters show up). It's neat what a simple color change can do in the later levels...
I like the idea that the dangerous "bushes" are actually the monster's back spikes, just thought that was a cool detail :)
By the way if anyone is stuck on how to play, [first off, you move using the arrow keys of course], you can click on the gray walls to remove them, and you have to hit the yellow circle at the end of the horns in order to progress.