I tried
go run github.com/matthewsedlacek/reverse_gravity@68ce9a0
But did this work on your machine, Tinne?
I see what happened, yeah, that's my fault... I had the game downloaded too and ran this within the game folder itself. That explains why it was ok for me. So silly. I basically downloaded, played, then went like, hmmm, can't I do this easier with just "go run"? Tested, worked, shared without realizing I was already in a unique context myself.