Pretty much what Counterfeit said. This hack is more or less good overall. The first two levels are really well done, both in terms of design and aesthetics; really loved the HDMA. The last level isn't as good, unfortunately, it feels like rushed, lots of empty, repetitive sections. Some even make you stuck permanently if you're not big Mario, since you'll need to break turn blocks.
Another hack that, although has multiple levels, is worthy of the huge level tag because Bowser's Castle is extremely, excruciatingly long.
Make no mistake of it: the HDMA effects in this hack make this hack look impressive, especially for a hack made in 2007. Torento Entrance in particular has a beautiful sky gradient that seems almost like mana and the stars move fast with parallax scrolling. The first level has a fiery glow, and the underwater level flows.
Unfortunately, that's all I can say that's positive about this hack. The levels drag. They become repetitive; obstacles like to come in threes. The underwater level feels like it's long, cramped, and uneventful.
There are a few glitches, namely the sprite tile memory in some parts. The pipes appear to have lost layer priority since Mario and Piranha Plants go above them, and it looks really gross. The title screen text also gets eaten by the file select menu.
What really sucks about this hack is in Bowser's Castle, there are numerous areas you can get permanently stuck: in areas you have to spin jump to break blocks, of an enemy lands on you while you're breaking blocks or if you walk into one before you can start spin jumping, you have to reset the game to get out or hopefully that enemy's still around so you can die if your savestate isn't recent enough. It's not a savestate-free-friendly hack as a result.