I am completely stuck trying to get alien hearts. Even when the alien's shield goes down after 5 attacks (def goes down from 25 to 3), even with exotic gun (dmg: 14) damage is completely blocked. Is this a bug?
Ahhhh thanks! I thought I tried back and front, but apparently not. Now that I knew exactly what the issue was I was able to defeat them and reach the last boss (which kicked my butt).
Yeah, the final boss is pretty tough... especially since I made it harder after players said it was too easy. With the right preparation/equipment, you should be able to do it though.