This is a really cool idea, the ghost momentum is a really cool idea and movement as a person feels pretty good compared to some games I've played. Unfortunately my issue does end up with the ghost, mainly its momentum seems random. There were plenty of times where I would do the exact same thing, and one time I would go flying, and the next I would move an inch, which made certain sections a crap shoot if I could make the jump or not. I really liked the atmosphere though, and I appreciate the difficult level design.
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Actually the spikes felt fine, my biggest issue was with the springboard/trampoline things. I wouldn't move left or right at all and each bounce would somehow be a different height under the seemingly same conditions, so I had to sight read how fast I was moving upwards to know if it was a bounce I could proceed off of.