not good at all
I enjoyedthis at first but it gets boring as one progresses, becouse every battle goes the same way: you capture the extractors, place turrets nearby so the enemy can't take it back, buy siege turrets and destroy the base with them. You could buy drones too, I know, but they are very weak, and would be only useful if you could spam the enemy with them. Also they take away places from the towers. Probably that's why the enemy doesn't build drones either.
Then in Heaven 3 it get sboring ecouse you can't do anything: when a battlecore should be destroyed, and I get no support at all, and even the enemy fighters are stronger than me, so I can't even get near the extractor before they kill me! And no decent parts can be found wich would make me significantly stronger, and if I try to get stronger by attaching many parts, the only result is that I become slow as hell - and the enemies still tear me apart with ease!
This game should be either a shooter with a few strategy involved, but then one should be able to upgrade the ship to a real strong one; or a stratagy game with a small shooter part, but than you should be able to build a grat army and manage it better! As it is, the game failed in both category for the abovementioned resons.