Regarding the interactions being limited, that's very fair! If anything, it's perhaps a good thing that you didn't entangle yourself with more-complex mechanics on your first outing. So, perhaps take my critique there less as something that should have been done differently in this game, and more as something to think about for later games. And since you're already aware of it, all seems well!
As to design documentation, I don't think that it's a problem if it's part of your process!
As to imitating Ultima VII, I'll confess that it's been long enough since my last playthrough that I don't recall what the player had to click on and what could be dragged, so fair enough!
Anyway, I'm interested to see what you make next! ^_^