That tower song is actually pretty interesting. I can hear bits of Trigger's forest theme, and even some bits that sound like "Chronopolis" from CC. As some others have pointed out, it also bears some resemblance to ALttP's dungeon theme. Pretty sure it's all coincidental, though, or at best a subconscious influence. It's just not explicitly similar enough to any of these tracks to constitute an homage or plagiarism.