I wanted to create a journal later for quests, but it did not occur to me that I could also add the contents of the different letters to it. I will think about it. Hotkeys is something I also want to make but I planned that to be part of the equipment system, and not a hotbar (I try to limit the amount of UI), but I guess I am not making the game only for myself :D Regarding the Esc button: that will be fixed, it is the most common feedback that I got.
Good suggestions, thank you! :)