I liked this demo. It is honestly the only hack (besides Kaizo Mario) that I played all the way through. Admittedly the only reason I played it was because I saw wall jump and wanted to see if someone had used my patch or if it was just blocks (I'm narcissistic that way). Did you use the Wall jump available on the site or did you make your own? Either way, you seem to have the same glitch in it that I have, which I could post here if you wanted me to, though I'm not going to now since I know no way of fixing it and most people wouldn't even notice it.
Anyways, there was a few things I noticed that I'll post here so you can see them.
Just a minor thing, but i've seen a lot in hack removal log about bottom row tiles where you can't see them. Not a problem to me, but some people might...
Erm... this kinda appeared to be on purpose, but did you want the player to be able to float like this?
yeah... I jumped on a bunch of those red Pirhana plants and this happened, though I can't for the life of me think of why...
Weird black tiles when the events happen.
That's pretty much all I saw that was wrong with it, beyond all those things this was actually a very fun hack.
As I said before, if you want me to post the glitch with the wall jumping here I can, but if you don't want anybody else to see it (as I kinda don't) PM me and I'll send you the glitch.