This is fun! The two things I would most like to see in the paid version would be the ability to mute the music, and a "folder tree" navigation structure that allows you to jump back and/or see folders where you left things. It's easy to get lost at the moment.
Additional settings for audio and other things is a must for sure.
I don't know if you noticed that you can mark folders by pressing right click. I like idea of "folder tree", but I also like how minimalistic and fiting folder marking is. Also teleporting between folders would be weird with items that trigger when player moves to new folder (for example, bottle of water). Maybe I could somehow incorporate both ideas? Maybe "folder tree" only shows where all left things are and doesn't allow teleportation? I'm not sure.