Nice little game !
I didn't find the last level too difficult. It was actually the most fun of all of them and would have enjoyed to play more like that one.
The level with the pushable box was actually way harder as the ghost was very fast & the flag placement just after the ledge made it very hard to get it right)
The controls were also a bit tedious and sometimes if felt like it didn't register the correct direction.
(but it dind't stop me from completing it) maybe using left click and right click would have been a more enjoyable control pattern.
All in all its a neat little entry. good job :)