So pretty frustrating for me. I really like the idea of hidden platforms, took me a while to figure out how the ghost works, but it's nice to have him, otherwise it would be impossible. Maybe the moving platforms could be faster or there could be more, so there's less waiting.
The art is nice, so is the audio, except the death audio, got annoyed by it in lvl 8 :D
Congrats on a game, it has a lot of content.