What button is supposed to back out of menus like your backpack, chests, etc? Every time I've managed to get into one, I can't get out. Escape just opens the pause menu, and no other button (space, left or right click, etc.) will close it. I managed to get out once somehow but it gave me a prompt like I was supposed to confirm whether or not I wanted to put my berries in the chest, and clicking either the checkmark or X did nothing. So far the demo seems very buggy (which is understandable), but it means I'm not able to really get a feel for much.
EDIT: After managing to somehow get out, my game froze. It's happened twice now, forcing me to restart the game. Both times within less than 2 minutes of starting. Interacting with anything at all causes my character to either just get stuck standing in place, or causes me to become stuck in a menu I can't get out of.