This would mostly for the developer,
The game mode shows a lot of promise but it feels a bit too barebone and I think it can be improved without any radical changes.

First off all the game mode should allow you to gather/get resources in a way or another. So on the existing resource point, you should be able to build some generators.

The resources can be used to build an armory (or have it build already somewhere) and to purchase upgrades from armory (so you can last longer and have a progression)

With the resources, you should be able to purchase reinforcements with drop pods. When you click on a drop pod you should have existing options to purchase as reinforcements again as sense of progression (also new slots of drop pods can be purchased from armory) and if you want to go deep the units slots from the pods can also be unlocked by building different builds. I think you get my point. These additional buildings shouldn't need to be protected (you only upgrade them from distance)

Main idea is that the mode needs a sense of progression and my feedback is:
Gather and protect resource points->purchase upgrades or army reinforcements
But if you want to go even more deeper. The drop pods should have a refresh option where you can spend resources to get better reinforcements.

Cheers