how about an elite unit for each unit than when you upgrade them it increase their range or their damage too and the general would be a lot better like the rifleman becomes sniper, comando becomes machine-gunner something like that
how about making the strenght to do something that allows you to get weapons, how about it increase how far you can trow the grenade or maybe reduce the recoil of your gun. Also a artifacts or items filter on tourney
if you want to win the alien campaign you must get really skilled, i can give some tips of how i passed it on armor:
1.- the katana is very useful at rocket race in the alien campaign, it gives a good extra damage if you are close and the chance to reflect the dangerous rockets than can kill you in one shot.
2.- i recommend to have the rocket launcher (the initial one), the holy grail and also the initial shotgun, this are all the one hit kill weapons, besides the holy grail its very useful cause the raze soldier and j. rockit has adrenaline rush and with the fire of the holy grail they wont have a chance of survive.
3.- a little secret, there is a glitch that when you are reloading a gun then you pause it keeps reloading soo its like an instant reload, it can be very helpful but it also takes out the emotion of trying to keep you alive when you reload
hope it helps
you need true skill and a lot of patience, maybe a little of luck for winning at the alien campaign, one example: in the rocket race, the frozen death is not a very good weapon soo you got to use your others weapons and try to compensate your partners, some useful info: the raze soldier has 150% and also has the adrenaline rush so it needs more shots, j. rockit has the katana so try to evade him at close range, hope it helps