This is one of those titles that released on the master system but not on the NES that Nintendo fans were jealous of. This is them showing that we want more Master System games to go multiplatform.
Honestly, it is because Nintendo fans are big 2D platformer fans. We did buy 30 million copies of NSMB after all. This should surprise no one. Also, have a game in a cartridge is much better than owning a game on a disc.