I don't even like the source material here and this is still a good mod.
Putting aside my two big complaints that really boil down to "I don't like Pipe Crawler or MX very much," the other two characters in this are great. Lucas is a particularly pathetic Mario Bros 1 Luigi, and False Hero is an EXCELLENT Mario 1 "Mario But Wrong."
The pixel eyes that could just be pixel eyes but almost look more like empty sockets, the weirdly lanky proportions, the off animations and lack of idle besides standing in a slightly creepy pose. False Hero rules, and if he was in the source material for more than like two lines of dialogue or one Friday Night Funkin' verse I'd probably be a lot more interested in it. As it stands, I want to make a special note of the amount of care put into him (and Lucas) here, as characters who could have probably been skipped with nobody complaining. I definitely appreciate these guys.
But what I REALLY appreciate is the Mario Bros 1 inspired HUD, usable with any character after hitting up the Character Select options. It's minimalist, it communicates all relevant information, it looks snazzy, and it even has a better act select. My only real complaint there is that it doesn't trigger when star collection is set to non-stop, at least with OMM, and that's really just a bit of default behavior I don't like.
This is a good mod for any fan of Mario 1 or spooky stuff, even if you don't like Mario 85 very much.