Be careful, way too much particles when an ennemy dies. Several times, I thought it was some missiles from somewhere. But it was just enemies' explosion.
Otherwise, love your little turrets and the spawning ammo.
Little bug: when selecting my base, in the menu, arrow keys made me navigate through the menu, up and down, but also move the select square on the ground. But I guess you're aware of this.
Aside of this, I love the capacity to be useful. I mean, putting turrets is cool, but being able to play and shoot at the same time, I love the idea.