Nice! The almost Limbo-esque aesthetic is presented coherently through both art and animations (and is frankly awesome), and the ghost mechanic is satisfying. Super duper polished for a 3-day jam too.
In a perfect world, some more audio fx + spatial orientation for the wall opening sound so you can tell which wall you opened would have been fantastic additions, but it's more than understandable that you weren't able to implement that given the time restraints :)
Fantastic work!