One minor improvement idea that I feel would be super handy, is to have a support for 2nd fire button to return to the previous menu quicker - especially useful for inventory menu, so there is no need to move cursor to "quit" tile to go back
I'll keep that in mind. Another idea I have is to remove the exit slot in the inventory and instead use the scene boundaries to exit the inventory. This would create an additional inventory slot, and you could exit the inventory from half of the available slots. Of course all of this would only be implemented in future games.