First off congrats for making a working game under 48 hours !
This is actually a quite nice puzzle game, though it lacks a bit more mechanics and levels to really show its potential, I felt like I've only done the tutorial here.
I must say I love the atmosphere and the music. The art is nice, though I'm not sure about the background of level 2, it kinda gets in the way of readability.
If I can be nitpicky the lifetime of the ghost is super short, which is frustrating when you're trying to understand how the game work in the first level, but I guess this is more of a level design issue.