Thank you for your valuable feedback!
I agree with your points and I'll look into them.
About backtracking, the way I progress through the game I don't really have to backtrack at all because of the shortcuts to different areas so I'd like to know what specifically is the problem with that. Or maybe I'm just skipping things like not going to merchants until I return to the hub. I'm aware there's a longer section in the game (around 14 floors) until you return to the hub so maybe you mean that because there you'd have to backtrack a lot to return. I've been planning some sort of fast travel or traveling mechanism to go from specific points to the hub easily back and forth, but haven't figured out yet exact details.