This is not a game. It's a tool to make it easy for other games to use gamepads by handling the configuration process. If you go through this configuration, then any game on NewGrounds that implements this should be able to use your gamepad reliably. You only have to do this configuration once and it will work for every game on the site afterward. So plz don't blam this kthx.
If you're a game dev and want to use this for gamepad support in your game, here are demos and instructions on how to do it in various languages / engines including source code.