totally agree with alspal, the broken outlines don't help, especially with using pure black on the outlines. If you're going to have everthing playable with an outline, then give one to the yellow/black striped objects too.
Also consider lightening up the outlines a bit, pure black is too dark imo. Maybe something like this?
I really like this character, if you bring everything up to his standard you'll have a lovely looking game.