Right now the game is not optimized for RAM usage. 6gb MIGHT be okay, but even then you're going to have very very very long load times at the start.
How do I get into simple programming for something like https://allyjamy.itch.io/afterfall?
This forum is for discussion of and troubleshooting for Underspace. If you have questions unrelated to that, you can post them in itch's community forum here: https://itch.io/community