I see more runs on here than last time i was checkin' by, so I figure I should say, there's a speedrun.com page for shelled shinobi, for anyone interested. If ur not, that's fine, but some people might enjoy it, and just not know about it.
https://www.speedrun.com/shelledshinobi
Sincerely, The Goddess of the Game, Crayonatee.