About that… according to the TCRF page, the characters were originally going to be more traditional; but seem to have been all changed to Wario Land 3 characters rather late in development… for some bizarre reason.
To be honest though, that’s the most notable thing about this game; because it is a very poor version of Dr Mario otherwise.
Also, fun fact, this game came on the smallest cartridge to ever grace the N64 (a mere 32mbit/4MB, the same size as DKC on SNES). This was a budget release in every sense of the word.