I didn't really play it all, but I'd like to call your attention to unfairness. In the level #1, when I climb the vine near to the beggining, I'm almost always hit with a rock, with no enough time to notice it and dodge it. There were a few other spots where dodging enemies was nearly impossible too, so keep in mind to avoid that when hacking.
You're a kaizo hacker too, right? Because your hack has a lot of munchers.
I found it pretty enjoyable as far as I played it, just kind of too difficult, but that shouldn't be flagged as an issue at all. I liked especially your palettes. Also, for a vanilla hack, I didn't find those SMB1 graphics in the level #4 (I think), but I'm not sure if there's a reason for them to be there anyway, so...
Keep it up!