I thought of a normal, usual part of a game that I could change, and I came up with controls since they're basically a standard. Changing controls is also a pretty unwelcome change because it requires you to re learn how to play a game from zero, and as if it wasn't enough, a common and intuitive control scheme is something pretty expected in any game. I also added a sudden change of colors, sounds and music to further fit the theme of aberration. Lastly I made sure that you don't quite understand it when you download the game, unless you really look closely at the "controls" part of the game page where there's a question mark to tell you that maybe it's not actually like that.