Great game! At first, I was a bit confused as to what to do, but once I found the "ghost" ability, it was all very smooth sailing! Nice interpretation of the theme :D
A bit of feedback- although the puzzles were clearly very well designed, I felt the game was a bit lacking on the technical front. The graphics were very rudimentary, and there were issues with jumping while colliding with a wall (which made some parts of the game a bit frustrating to play). I also think it could really benefit from some music/sound design. That said, it's a good effort overall, and I had fun playing it, so good job!
Btw I would appreciate if you could rate my game as well :) Enjoy!