I like the idea of the cloak, very much... It makes the humans to leave the base in stage 2 or gives the opportunity for a builder to leave a nearly destroyed base... And i think its still balanced...
But i have an idea to camo armor: camo armor should look like a very thin black suit covering all of the humans body... It should make the user nearly or completely invisivle, WHEN not moving, shooting... It should also cease function when the user is damaged... Like the cloak, but it makes you invisible when you are standing or crouching still... The user wouldnt be able to buy jetpacks nor battery packs nor helmet... The armour wouldnt function as armour leaving the human completely "naked"
OPTIONAL:
It would have its own build-in weapon, a hunter-killer rifle... The hunter-killer rifle would be a modified mass-driver, which would deal triple damage when shooting while cloaked, and its shot should have slight poisoning capabilities, because after the hit it is slowly desintegrates the body of the target for a few secs... This would triple the damage of the first attack, and when the user is revealed because of the attack,it would function like a normal mass-driver... Of course the user wont be able to buy any other weapon... Because the items weaknesses it would give the wearer a slight bonus to movement speed... (120% movement speed when wearing the suit)...
Optional 2: it would change the users blaster to a solid-slug pistol, which shoots with the damage of the rifle, and at the firing rate of the lasgun, to give a better help to the user when he/she runs out of mass-driver ammo.
This suit should have the cost of 400 and the humans could buy it on stage 2...
On the other hand the aliens could have the other pair of the "camo stuff"
The Stalker... The Stalker should have the same stealth abilities of the camo "armor"... It would have maybe 150 hps and would look like a humanoid creeper or an insect... It would have a fast claw attack with moderate damage... It would also be able to shoot poisonous, movement speed reducing spit, which has medium range OR it would have the abilty to use the gas attack ability of the adv. basilisk... And finally it would have a fast movement speed, a bit slower that the dretch, and slow speed when wallwalking... I imagine it as a hit-and-run creature, which hides invisible until a lone or small group of humans get close... It uses its very fast movement speed to ambush and charge the humans... Spits or attacks them with gas to make them more vulnerable and then tears them into pieces with its claws... Before anyone could think about what happened it outruns the humans and hides somewhere to regenerate...
I think the camo and the stalker are a good pair, and they would bring some "sneaky" feeling and tactics into the game... My opinion is that they balance each other but i am not sure about that so if you have opinion or idea about it share it plz, but if you say it sux please explain it why!