This is a really interesting concept, with awesome audio and cute visuals. Juggling between the mouse interface and the game was a bit unintuitive for me, maybe it could combine the numpad for numbers and colors, etc? Not sure how that would work the images puzzle though. I gave up during the (SPOILER) fire levels after trying a couple of times.
There was a bit of a lack of feedback some times - he images green / red colors could be a lot more discernible, and it wasn't clear if floor buttons were actually pressed.
Very nice entry!