Video games need help

I'm making a game but want peoples thoughts and input to make this better. The story is simplified as follows:

Tessa Whitney was only 6 when the apocalypse started. Monsters flying out from holes in the sky. Her mother died her father disappeared when an old man looking to be in his 40's took her in and built a camp around her. Many people she got attached to died. Now here we are 2 years later. Tessa is 8 and knows how to fight. A child genius who had to grow up fast. And friends that she hopes she won't lose. This is where we begin.