why press arrow keys to center? use arrow keys to move and space to center would be better. and make the centering more smooth,which the camera moves to your plane but not teleports.
I don't think the drills are fair. Because each drill is unique, the drill should all have similar stats other than the ones that are unique to it. Same for the hulls (e.g. I like H2 Caterpillar's true vision, but it has too less health)
It wouldn't be realistic to alert you for upgrades on components a lower tier of your current component. (e.g. I have a Wasp hull and it is still showing upgrade for my Grig hull.)
A few thing. 1: It would be nice to have levels for each building so you would u can upgrade individual ones. 2: Hot keys would be nice. 3: Add a few more elements maybe. 'Cause if you have every played Endless Expansion then this is like very simple. 4: I wish there is some sort of "heat pipe" where you could move the heat.
in the level Beresad's Liar, the dragon can disable your towers for a short amount of time. But that doesn't work on Battle Mecha t-200's. The can still shoot, its just that you can't upgrade them or move them.