I didn't have problems with the colors, but was confused about what to do in the start because wasn't seeing any spheres and didn't get the HP system before a few deaths. Once I saw the first circles and understood the layers system, started to think it's a great idea. The basic idea is straightforward: avoid enemies, don't fall in holes, collect spheres, but the layer system made it more interesting and added...dephth? XD
The thing is, after you get used to the game you just don't die anymore. Is it possible to win emptying all three bars? The slow down at the borders was a bit annoying, but the overall gameplay was smooth and I didn't catch any bugs.
The art is also nice. Very good work.=]