A pleasant hack full of classic Mario level design and SMAS SMB3 music. The hack has an open overworld, meaning every level is accessible from the beginning, and start-select can be used to take you out. It's also symmetrical!
There's a lot of standard platforming with the occasional P-switch run but no puzzles, long-distance item fetching, or any silly gimmicks you'd see post-SMB3 except the layer 2 scrolling in one of the castles. Every level feels different, well-designed, and has a steady difficulty curve. I do believe I ran into one area with sprite tile memory problems.
Some people may be annoyed by the music note level because there's a lot of boinging involved in multiple directions but I feel like the author does a good job of making it both simple and increasingly challenging as the jumps get narrower. The screen-wrapping ASM was a nice touch.
The low point of this hack would be the awful foreground palette in Glacier Pass, the one level that uses ExGFX. It's still a decent level, themed around the fire flower and ice blocks with hidden goodies and traps.