I don't know why but I'm fascinated by Ants these few days so I get this idea.
You are reborn as a God of (whatever ant kind you choose) Ant and you are tasked with a little colony of ants. As they eat and kill you get an essences in which you can use to upgrade something in an ant, You can use it to upgrade the queen's rate of production, you can use it to upgrade your ants attack, you can use it to enlarge your ant, you can use it to unlock a special kind of ant...etc.
That's the gist of it, oh and I want it to last until it's powerful enough to took over a kingdom. Have fun on whoever decided to write this.