I really enjoy the game. However, there are a few things that I feel like would make it more in-depth and or more entertaining. I realize the game is still in the works and so if these ideas are already being worked on or said than I apologize. Just my opinions I gathered while playing!
Characters-
The aliens move very fast and kill you very quickly. To make it more fair, slow down the aliens or make their attacks less powerful. Thus, giving the humans more of a chance and less of a chance of the aliens rushing without any resistance.
Slowing down the characters in general would give more 'weight' to them and so you don't feel like you're running on air.
Quests/objectives-
making different modes would be very fun. A 'zombie like' survival would be very entertaining.
I may come up with more but that is all for now. Again, these are just opinions and I do not mean to criticize in anyway. :)