My game keeps crashing because it does not have enough memory

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here

What actually happened was...:
Game keeps crashing due to not enough memory. I'm playing offline but same problem. I can go to title screen and play again but inevitably it crashes. The crashes can occur as fast as 1 second of game time up to 1/2 hour or so.

Steps to Reproduce:
1. play game
2. it crashes