Well the ground and walls are supposed to be visible. Are you playing the html build or the download?
html
Sorry you're experiencing that bug. Unfortunately we can't do anything about it in the jam version of the game. Can you send a screenshot?
It's possible the download would work if you don't have a problem downloading games.
ok buddy it works in the browser now i think it happened when i got your game through the random game picker in itch.io !
