Overall well done, though I have some issues. First one is that in each level you spawn inside a wall giving a quirky view and that you don't face the exit right away. So you lose valuable time. The other thing is that when using H for a hint all platforms turn invisible again, even those I had visited before. Might be intended, but I think it's unnecessary. Movement could be a tad faster.
Just a personal view on platformers: they just feel weird to me when I can't jump. :o
I liked that there are trampolines in it, makes fun bouncing around!