Thanks for the feedback!
I agree, there is some lost potential in the ghost power. I tried to think of a way to make it more fun and interesting to play as the ghost, but nothing really came to mind.
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I think it would be cool if the ghost couldn't wander so far from the body, so you had to plan when to ghost up in order to reach the thing. Platforming wise you could plan levels where the player has to ghost in midair and the body pauses while you collect the thing. Could be cool. Either way fantastic job.