Fantastic game, very fun mechanics and I also really like the aesthetic.
One thing I wish it had was a way to see factory and turret coverage - I'm the kind of nerd who wants to keep the whole base roughly equally protected and the distance between turret and ammo factory uniform and low, and I feel like this sort of game appeals to this kind of nerd, so I doubt I'm the only one.
You can already see the range of a turret you're building, so a hotkey to show the ranges of the turrets of the same type seems easy to add. Factory coverage is more abstract, but a similar hotkey to highlight the factories of the current type would already be a big improvement.