can anyone win very hard in alien terra? best trick i use is to sell turrets when damaged and then build them right back. apparently it sells for the same price as needed to buy it in the first place. other trick is to build laser turret on the right side, but it's still hard to beat it.
http://youtu.be/bDwkt2KsNuI
http://youtu.be/bDwkt2KsNuI