Each time you click the button, it gets harder. -- D stands for "Difficulty" -- D10 = You are given a flashlight with good batteries. D20 = The button starts seems to be transparent. D30 = The button gets smaller and bigger. D40 = The button changes colors, camouflaged. D50 = The button seems to be pixelated. D60 = Your flashlight starts to lose batteries. D70 = Fake buttons start to make an appearance. D80 = A cat starts to make an appearance.
I will probably make the full game soon, but that's very unlikely. Feel free to remix and add fanmade ideas. If I do make the full game, I might add your ideas.