Nice job, this was fun to play. I really liked your art -- the palette in particular was really well chosen, you got a lot out of a small number of pixels. The surfaces in the different regions were really vibrant and cool. At one point after getting the double-jump, I got the blue crystal to the right of the start point, and then, like an idiot, I decided to see if there was a secret area if I leapt off that cliff to the right and...there wasn't. I was somewhere below the camera, perhaps just continuously falling, and I had to quit out of the game. But I had fun with it, nice work!