This is a fun game. Reached lv30
Here is some though when I play the game:
1. You should never invest unit range because your units would stay around the factory and the enemy AOE attack would damage your factory.
2. Enemy come from both side. We need some control on how many unit can a base on each side span or better, max unit count should be a factory upgrade.
There is no timer. My guess is a bit more than one hour?
With my gamer mind, I realise I can move factories as soon as we have enemy form both side. However, there is no room for moving in the later game:
If I move to the enemy , nothing changes;
If I move to the base, the AOE damage my base too;
If I move the base to up or down, half of the enemy would attack the base directly.
