u/Automatic-Shop-6951

I remember playing this 2-D platformer on what I think is cool math games a few years ago. I remember player character being a little yellow triangle with two little nub legs, and you could transfer from being in the real world and have a typical platformer physics and being on paper where you could move boxes and move in a grid system, and I remember they’re being portals and being able to walk closed scissors unharmed if anybody knows what I’m talking about it would be amazing if you could help me find it.