Excellent little game. Graphics were spot on and personally I thought the character was just fine; making an isometric walk animation isn't easy. I got a little bit stuck on the environment somehow in the lever socket room but managed to wiggle free!
The only thing I'd add would be a minimap of explored areas to save backtracking (accessible via holding down a key maybe so as not to steal screen space?) although having stairs/different levels makes that a bit tricky.
Overall I though this was great, well done.