The first idea i've have gotted into he game is that you play the game, but the game stops for some reason. So you search and find that the developer has forgoten to eliminated a while interation that makes the game frozen. So you enter the code and you have to the destroy that while loop by shooting it in a top-down shooter. But because the time limits the idea was ambicius and its preffer to take it time to make it.
One day, i will make this idea when Unity doesn't break me because for some reason its really slow, when before it isn't.