Very difficult game! I like the depth of puzzles you were able to create on such a short notice. The action element added to the puzzle genre is definitely unique, but there are times where I want to both push the box and move at the same time to avoid death, but can't do it quickly enough, and perish. Maybe a separate input for *move box only* vs *move box and player* would make that happen less often?
Anyways, great job, puzzle games are something I can't really fathom developing (yet), and this one is very well done.