Great idea, terrible execution
How does such a good game get only 4 stars? And a generous four stars I might add. I'll explain. It's an interesting concept applied in a way that should be fun. Should be.
The fun factor is completely removed by the extreme frustration endured not from difficulty, but from terrible platform boundaries and terrible collision detection.
The guy dies from the slightest bump on his head, and some passages are so narrow as to allow zero room for error. This would be fine, but the actual surface boundary where he should walk is sometimes impossible to gauge.
This isn't just limited to guy. The ghost sometimes has to squeeze through tiny passages, and unless you know where her actual collision point is (which seems to be right at her eyes when she's crouched) you won't get through.
I always hate saying that a game needs to be easier, but the way this one is now, it simply isn't fun. You have to fix the collision detection. Ideally, any point on the character would be considered solid. In that case, some of the passages would have to be widened.
What can I say, I hung in there til the last level, had some fun, but ultimately I have no choice but to give a mediocre review.