I, Robot is a contender, depending on your definition of platformer.
There may be some from before polygonal graphics. I've toyed with doing an NES game that just throws sprites to draw corners, and while I'd be shamelessly ripping off how Mario 64 works, I'd be doing it on hardware from a decade earlier. I've done an FPS on that platform, and I can confidently say it wouldn't even have been the first FPS, had it released as a Famicom launch title. (Scratch that: the Famicom released in '83, The Eidolon was '85.) Video games are a very young medium which nevertheless have abundant prior art, no matter how hard you qualify your alleged firsts.