hi guys, I am new to game development and really struggling to find a good idea but unable to get one, can you please share your discarded ideas so that I can get some good idea?

i had an idea where you would control two characters that would move in opposite directions, so if one was moving up the other would go down, or if one was moving left the other would move right, etc. I discarded it because I got a better idea by the time i started developing, it should fit with the theme.