Would love to test my biter defense line, but the sandbox currently has no option of adding in enemies to shoot at. Please add a feature to spawn in biters, spitters, etc. or something that emulates enemy targets so I can stress test my test defenses. Spawners would be cool as well, but not as important.

I was also wondering about this, but I'm still curious about the UX, how they might interact with the surface (run towards center, run towards nearest, stay still, waypoints, etc), and how many of which kinds, stuff like that. I'll think more on it!