There's this piece of cross section sticking out right at the beginning of the level, presumably from the piece extending off-screen at the end. Change the exit in this sublevel into a door.
Put an edge object to block the edge of the screen. The chomp rock rolls off very easily and it can push me off and kill me, too.
These Zeus Guys are absolutely atrocious to deal with. Get rid of one of them and replace this rock with something flat, maybe a brown platform.
You could do away with this awkward cement wall by extending the stair case to meet the ground and moving the small rock one block to the right.
Another tricky set of Zeus Guys with a cheaply placed blind boo overhead. I'd recommend replacing this with a wall of clay blocks that need to be shot through. It would be more interesting and a better demonstration of how Boo Man's Bluff behaves; I think this is the first time you encounter it in the hack.
Blind drop here. Also, the edge on the right doesn't extend all the way down to the ground, so it looks strange.
This entire segment is extremely laggy in snes9x. I wouldn't recommend mixing the Pyro Dangle with so many sprites in one area.
Anyway, I made it to the Baby Mario segment before I died and noticed that I hadn't come across any middle rings. I also hadn't made any savestates as a result. I assume you haven't put them in yet? It would be a good idea to put some rings in even if they don't work. I didn't feel like replaying so much of the level, so I stopped after that.
The bonuses in this level so far feel like they've been spread very thin. It might benefit from being shortened somewhat.