My gun wasn't firing at my mouse's exact position sometimes. I'll give it the benefit of the doubt and that maybe it's a gameplay element like accuracy. Still, a good game that provides some challenge in later levels.

You did great with the theme, you interpretation of dirty and clean was very well used, and some puzzles actually made me think. The only critique I can give is that somethimes the physics are a little bit clunky, and the aiming reticle isn't always representative of where the mouse actualy is.
I reached level 8, unfortunately it was too hard to come back to the beginning to exit it, but overall the game is pretty cool, congrats!