Thank you for offering this game for free. I'm sorry I cannot give it any positive rating, at least not at the moment. The game needs a lot more explanations. The description goes into the right direction, but I had absolutely no idea how to sacrifice the free units (called "drifters"). I took me ages to find out, that I could place them on the yellow pad on the right, to sacrifice. After that, I could finally place a fighter, but I could neither find any way to attack the enemy units, nor the enemy directly.