Few simple ideas, i will edit this post over time:
Humans
-Tissue Regeneration Device - Regenerates the human extremely slowly over time and accelerates slowly as time passes from previous hit, but replaces the medkit. This helps a human last longer in big maps , but prevents him from regenerating mid-combat. It would somewhat also help humans from having to run back to base after combat.
-Some sort of electrical regeneration device, creates clips for energy-type weapons over time, works without a reactor. Kinda like a portable super solar panel that works everywhere.
Aliens
-The acid gas buildable slows down humans - Because right now, considering how 'fat' the tubes have become, i think them of useless buildables. [They can't be hidden well anymore, and have a larger area that can be hit without detecting the human]
-Maybe another class, apart from the flying alien, that can do little damage over extreme range. To counter camping humans.
Other:
-At least make the tyrant heal faster, as long as it doesn't become crazy like the adv rant from korx did. That would just increase hall camping. Otherwise, i will have no use for tyrants; they can't tank up much damage, they heal slow, they can, but not efficently killwhore...
-Improve basic particle systems. Take my visual mod for example. Its not completely my work, well in fact most of it is done by the creators of the Funko visuals [R Funserver CZ] and i modified it quite a bit.
Such as sparks, rather than a flame when you hit a buildable. Sparks may not make sense, but: Mini Flames comming out when you shoot it?
Also the gore/gibs, is one of the main features i like. But i'm not sure on the official rating of this game*, considering a lot of youngsters [10-18 years] play Trem.
*If there was to be one.