Absolutely not disappointed! You went the most original mechanic of the jam and I think it must have been pretty hard to design those levels. I would like to have seen more gadgets to play with but I totally understand the time constrains.
The gameplay was excelent albeit some of the controls were a little off. I'm just nitpicking here though. There was nothing that a quick restart could not fix.
Graphics were totally adequate. Nothing wrong to point there and the color scheme was on par and absolutely clear, just like a good puzzle game should be.
Audio was excellent. Cudos to your music guy. Well done!
I really have not much to say other than you should totally move forward with this concept.