Hi,
I played a few rounds of this interesting game and I've come to the conclusion that the Alien race is completely unbalanced.
Problem is how you attack someone: by touching them. That should be removed, if you want to attack something in an Ego-Shooter it has always been the left mouse button that has been used, why change that? Also it seems to me that if you stay in contact with the enemy, you don't attack again. You've to run away and close in again.
The attack seems to deal no damage at all. The human enemy survived 8 touches, while my little alien died after 3 or 4 hits(!). How is that balanced? A ranged weapon must always be weaker than a meelee attack. ESPECIALLY if the enemy only has a meelee attack type.