Wow, cool game.
I have only few feedback for you:
First, on an european keyboard the x and z buttons are far away from each other. So it is a little tricky to play.
Second, it tooks me a while to understand, that your hook must pass a barrier before he can crap things. I totally see the reason for it, but maybe there is a better way to communicate it.
Great Level Design and pacing. Really love the first collectable placement.