Very nice game! Even liked the GlaDOSian voice-over ^^.
I discovered a bug however:
In level 19, after the display "Now comes the hard part!" it is possible to land on both a red box and the three-bar-switch-thingie, right at the edge. The character is then stuck in "Just about to explode"-frame, cannot move and toggles the switch. Even going back to menu will not fix it --> Had to restart.
 "Concerned Joe"){kind=icon}