ive been seeing some bopimo games or levels of it being paper does anyone know how make it paper

You need to use the disappearing block and set "disappears after: 0"

if you're talking about something like https://www.bopimo.com/levels/3341 then you just gotta make most things really thin (0.25 or 0.1 in thickness). use shirts for images and npcs since those have no thickness (fitting the paper theme well)

if you mean something like https://www.bopimo.com/levels/5530 then that's a bit more complicated
what they did was make the level's terrain and things on the paper, then put invisible platforms poking out of the paper conforming to the drawings on it that you can actually collide with. neat stuff