Nice game.
I got stuck in a zone with the man, two small boxes and an elevator. It seemed like a good time to switch characters, but E and Q did nothing. (both boxes on switches didn't seem to help me, and I didn't have the patience to walk back and forth trying combinations.)
Maybe the core conceit (character switching) could be made available earlier?
Still, high marks for execution, even though I suck at puzzle platformers.