Nerf the alien overlord

This is my favorite game right now and I could play it for hours. I have beaten every mission except one which is the impossible one. The boss level "alien overlord" needs to be nerfed because if I can kill 16 enemies and still not win then something is not right. You should have less people spawning in between times where the ship is even there or you should make it so you only need to shoot the ship twice but 3 times combined with the excessive spawning is virtually impossible. This is the only complaint I have and is the only reason I didnt rate 5 stars.

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