Loved this! 5***** across the board. And so I want to help make it better.
Until I got hardlocked in a position and couldn't turn around (bug) my assumption was that I'd need to excavate recycling in a way where I could climb back to the surface & not get stuck down there forever. I think it'd make the game way more fun long term if you had to plan your excavation strategy so there's always a way to climb back up to the surface, rather than having an escape button.
the inventory system confused me - I thought the game was bugging when I couldn't pick up a soda can and it became a collidable object i could stand on.
the sell at shop action confused me. I didn't realize it was a button until trying jump, down, click on guy, spacebar, enter, and other keys around WASD.
Overall awesome job, I loved the art and the gameplay and would love to see this be a full game.
{{ps. if you do add a shop I think an escape rope ala pokemon would be a great item to sell}}