I think you misunderstood the theme of the jam, the theme is not shaders, there only have to be shaders in the game, the real theme is on the jam page, some other people also made that mistake, I guess I didn't make it that clear. Sorry, and I don't really understand how to play the game.
Viewing post in Shader GameJam jam comments
Oh Sorry! I was sleep deprived when it was published, so I'll try to fix that. The theme is clean the mess you make, like the one you listed, and the J button is used to attack the demons, with the K button used to clean the floor. I'll change the description theme etc to be what its supposed to sorry