Overall, this hack definitely feels like more than the sum of its parts. There are several obvious issues with this game (like some obvious youtube level elements and some levels that are just WAY too hard), but overall it's a memorable experience that I don't get from a lot of technically better hacks. As much as I wanted to scream at levels like Hot Beach Taizr or Trauma Tower for the sheer difficulty, the levels felt fresh and interesting. Like, I don't know who thought of having Boss Bass in a desert level filled with quicksand, but when I find them, I'm either gonna shake their hand, or murder them with a thousand nukes.
That said, there are some levels I genuinely hated, and not for a good reason. Bowser's Castle is just way too long (seriously, FIVE full-sized rooms before the midpoint for the EASIEST route?), and the glitch puzzle in world 6 has to be one of the worst levels in the entire series due to how glitchy it can get and how utterly insane it is to figure out. But overall, I didn't find a lot of levels like this, and I think the good definitely outweighed the bad. However, if you're not a masochist, you may want to put down saves during the marathon levels.
Overall, I'd give this an 8/10. There are some flaws, but I enjoyed this game a lot more than I expected given its age.
If compared to the previous one, this hack doesn't change much: what was good in Vip 3 got better and what was bad got worse. The design is always neat, full of ideas, some of them being excessively crazy, but enjoyable. Not much more to say, I guess.
Aesthetic-wise, it got better, with better choose of ExGFX where it's used. Silly assembling like stacked munchers and huge cutoff is still easily found in the whole hack, and it's a bit disappointing. Still, a good improvement from Vip 3.
Overall, an iconic hack, but it gets excessively complicated sometimes. 4/5.