Is it not a bit late to start your NEA? They are due in February if you are doing AQA.
I made my own chess platform (yes, another person doing a game of chess).
I made the standard chess game, my own variant called Big Bang Chess where there are two new pieces and my influence for it was from the Big Bang Theory where Sheldon invents his own new chess pieces and finally, I made my own chess AI, which has the rough strength of 1000 elo on chess dot com (About half of my own strength. I know because I made a bot account and tested it against people in the pool. I sought the permission of my Computing teacher first though and I was allowed to do it).