While the idea is good, there is a fatal flaw.
Spoiler
The mire spawners in the east are underpowered. Thus, the only move required to win is to use some gems on the Omni upgrades, build all of the Omnis, and keep the HQ alive.
Once this is done, the Omnis can be flown en masse through the non-regenerating Struc to the landmass, and the map can be won without firing a shot (Omnis firing at land will accelerate matters).
To prevent this in future:
Spoiler
While many weak mire spawners prevent the endgame from dragging while stopping one-Omni cache pickups, so does a single 4000-mire spawner protected from Omnis by roughened land and accessible from space. Place some Struc to stop HQ-rushing of it. Also advised is to keep energy sources away from the land if there are no particles around to regenerate the Mines.
Good map, but unusual tactics can make it trivial at the moment.