I got a high score of 13700!
At the beginning of the game I think it's too easy as you never have to repair any fences and all you have to do is run around and give ammo to each of the towers.
I really like the 3D models but I think the text could be polished a bit.
I feel like it gets quite repetitive. I'm not sure if this would completely solve the problem but upgrades/purchasing reinforcements might help with this.