I had a good laugh with the intro :)
One thing that kind of caught me by surprise is that I expected to step the story dialogue with Z instead of X.
I also noticed that the collision between me and the enemies, sometimes, behaved in a kind of odd way, with me getting hurt in situations an Italian plumber wouldn't.
With some polish here and there, this could be a great plataformer! As it is, it's almost there, but the small issues kind of creep up quite fast.
If you ever consider a Mac version and need a tester, please ping me - I got machines from different eras.