There are also two huge shortcuts (and a small one)... think you can pull them off?
Admittingly, it's a tad basic since I never learned how to use exGFX or tile merging, and it's been ages since I've done any proper ROM hacking. While I am slightly intimidated, I feel confident that my work is pretty decent!
The aesthetics are a bit basic, but the level doesn't look bad so it's fine. I liked the idea you based it around, and it was interesting because you could already see where you eventually had to end up going to progress, but you were just in the wrong "orientation". Also cool how the same sprites resulted in different obstacles when going through the doors. I got a bit annoyed at the two Boos with the Boo Ring, because I kept getting hit by something, but it's probably more my fault than the level's. Overall I liked it and you did a good job with its gimmick.