surprised that the actual proposed nazi SDIV concept is even wilder (they literally face hitler), also imo the possible combination of "protagonist with a bionic left arm who fights a returning hitler" is either inspired by the capcom game Top Secret/Bionic Commando or is a really weird coincidence!

actually i think hitler might only appear in the later and very different famicom port that actually post-dates izumi so maybe it's just one of those weird coincidences 🤷‍♀️