In the early days of SMW hacking, I would consider this a well designed hack that stands out among the rest. However, it's 2019 and we have a plethora of tools and assets we are able to use to create a unique experience to the rest of the Super Mario Worlds with different levels. Since the only major change is the overworld and level design, my rating will strictly be on those things alone, so the standard I hold the level design to will be far above another hack that uses non-vanilla assets. As for the general feel of the hack, it feels OK. Everything is put together well and there are no glitches or problems with the hack as far as I could tell. I can tell a lot of effort was put into this. I wasn't feeling very impressed by world 1, but world 2 was much more clever in the way you used vanilla assets.
What's going on with his foot? It's white.
Things I liked:
Clever level design
I like the general theme. Good use of layer 3.
Things I didn't like:
The idea was cool, but the fact Mario slides across this platform is weird. I feel as if it should be a sprite that moves as the same rate as the scrolling layer 2 that doesn't cause Mario to slide.
The throw blocks are redundant; Mario can use the key to throw at the coin block.
Everything about this
Then I proceeded to die in another level and get warped back to my last save. It didn't feel worth it to me to go back and play these levels again.
The boo generator was a cool idea, but I can tell that it was thrown into the level after the level had been designed. The natural empty path that forms didn't follow the design of the level, making it insanely hard. The way Nintendo originally used it was in a short underwater section with no enemies (iirc). This level was very long and had the boo generator for almost the entire thing. I'm not sure how long it went because I could not complete the level.