Kinda different, the purpose for this mod is build a safe zone in huge range so you can travel much further, it will be a problem if the alien break though your defense but you are 20000 unit away from home.
The artillery can only cover about 10% of areaI hope for. even if you build 10 artillery to ...

Here is the idea,
Define the size of a erea, like 1000x1000.
In the center of the erea, there's a facilities (or device) that can stop the alien nest respawn.

All you need to capture and hold it for awhile, maybe 30 mins in real life. in the maintime the alien in this area will go full attact ...

I finished the free mode days ago first time. it's fun but feels bored in reserch Rocket silo and get resource to launch.
So I think some game modes that might be fun.

1) Mission Object X
A ship that carry an important item named Object X was crashed on this unknown planet.
Your mission is search ...