Game is fun, but the idea isn't original (although inspired by Super Meat Boy.) It is quite challenging, which is alright. A lot of games like these on Newgrounds are super short (which this is not) and only hard because the controls suck terribly. I like the simple characters, albeit they are extremely small. Also, I would enjoy a little more contrast with the characters and the other black surfaces. For instance, if you are jumping to a wall, i cant see myself. Also i would enjoy some audio of some sort. Otherwise, great game! I'm curious, what game design program do you use?