Why make a zombie survival game? It's the literally the most generic premise for a game I can possibly think of. People will be bored playing it and you'll be bored making it.
Why not try making something a bit more unique? Treat yourself! Go wild! Make the game of your dreams! Forget what everyone else is making, focus on what YOU specifically want to make and what you bring to the table that noone else can. Get bold and get personal. Do it. Dare you. Don't make another fucking zombie survival game.