I have this game, and can offer up a few thoughts...
The extra levels are actually original. Some of them may resemblee a thing or two from the previous games, but they are indeed new. You can really see the difference graphically...
Another long-overdue feature is that you can SAVE the stage you're at as well as your armor level. (so if you save at stage 3 with Gold armor, you'll have it when you load up your saved game.)
I still enjoy it, even with the slowdown that plagued the SNES version, it's a solid game that will tide over folks who really don't care about Maximo.





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