The idea of the game is very nice and charming, the graphics are fitting, and so is the sound (the effects are quite well and diverse, but there maybe could be a litte ambient music) The controlls are o.k., but it often is hard to climb ladders for some reason...
In terms of game design and fun I`d say for my taste, the ability objects (don't know what else to call them ^^) are too far from each other and backtracking can be a litte tedious... also, not being able to attack as pure-ghost is understandable, but annoying, considering I pressed F instead of E in several fights und thus lost my powers.
As Madball said, the enemies tend to attack in rather large numbers and their hitboxes sometimes don`t seem to work quite as they should... Anyway - once I discovered that you can shoot projectiles across several rooms through the doors, most enemies sadly weren't much of a challenge anymore.
But overall - for a 48 hour compo entry, it is indeed a nice game to play, that has some potential if worked on furthermore ;)