Except you don't need a neural net to do this, nor would you really want one for it because it would be incredibly slow unless you use the GPU to run it which might be a bit busy running the actual game. It's like a "make game run worse" option.

In game AI can be pretty sophisticated even without the addition of neural nets which could be OK with determining strategy based on player action, but really isn't going to be good for the entire control.

This kind of thing is only useful as tech demo for playing platformers and the like with the same inputs a human player would, basically more like a bot.