same here when i use a lower resolution on my weak PC
disabling ambiant occlusion did the trick !
it's so fun ! a fan since the game jam version. Very laggy on my laptop without gpu after 10ish rooms. I would love some graphical options for low end machines. I had a bug a dozen rooms into the run : i bashed a lock but the door wouldn't open. sad
Keyboard For Shroom And Gloom