I really liked the idea of a Dead World, where you have to survive, attack other groups, and collect their resources. Some things were annoying, for example, the sound starts to irritate you if you play for a long time. It's a bit annoying, and in this case, you can make each sound small but different at different volumes, and this will add much more interest and remove the irritation.
I just found out about this a few days ago when I was experimenting with my other game.