Lots of good games there, and I always like an opportunity to say how much I love Xanadu.
I spent a good amount of time with the Famicom version of The Black Onyx, Super Black Onyx. It's really well done, and its first person crawl is surprisingly smooth. The battle system completely kicks ass, and it's neat how you can encounter random adventurers also raiding the tower and either fight them or get them to join your party if you have any openings.