hello I hope my feedback is ok
1. the robberflies moving different dice abilities are really OP in the sense that it's pretty much Nelsons momentum trait on steroids, due to each of the abilities being 1 cost each you can essentially get a free backstabber bonus dice utilizing juke and then backstabber again with boost on a different target or you can give your allies insane free mobility for free with rescue, I reccomend making each ability cost more then one charge of moving different and allow the robberfly player stock up on moving different dice kinda like the Ips-n kidd's jolly roger
also it's core power is the everests + it's once per scene ability but better maybye let it use up some of it's moving different dice to boost 1/per round in place of the free action boost and perhaps let it use juke as though it was a checkers piece while the core power is active? (although I don't know if this suggestion steps on the nelsons toes or not)
2.robberfly again, the robberfly ignoring engagement breaks the combined arms talent (and the cqb trained talent as well) which sucks because it's really cool in combination with juke maybye just make it immune to being stopped by engagement instead
3. The Aireina is awesome (and i'm not a big fan of melee focused mechs), being able to take a risk to force an opponent to use their reaction and then possibly counter feels amazing, the core power and the integrated weapon are super cool, and the concept of a fencer mech is peak fiction. (side note overload blade says "to force the target must pass an Engineering Save or become Jammed." it should say " to force the target to pass an Engineering Save or become Jammed.")
4. the Frag shells system does not specify that it also increase the blast radius of the weapon it is attached too if it already has a blast radius, lesson of sharesight should be an invade, the Minds eye systems psyche tech option should just say "on your next tech attack" instead of the convuluted sentence it has currently, Impose perspective should say "the target clears the following conditions: Prone, Slowed, Impaired, Lock on. the target then gain 1 heat for each condition cleared" this makes it easier to tell what conditions qualify and the order of operations of whats happening.
5. the plant hoppers core bonus being able to lock on every enemy, and bolster all it's allies on the map, is a tad bit overtuned given that it has sensors 20, perhaps instead give it the ability to bolster all adjacent allies instead? it would synergize with some of it's systems and the greater gaurdian talent (i'm just spitballing, take these suggestions with a grain of salt).
6. the Antlions decapitating strike is amazing, being able to stack accuracies for one big F you shot is fun and stacks with a lot of talents (in particular Brutal's Relentless if you utilize uncle comp-con with an innaccurate weapon to farm accuracies) though I do think it should have the effiecent tag due to the set-up it reqiures to actually pull off and it's limited scope compared to other core powers.
7.as for the Antlions systems there all good, but manual fire control doesn't seem neccessary to me especially since the lacewings active guidance mod already make smart weapons able to attack evasion instead, and I don't think it's other features justify it taking a system slot on the license, maybye make it an exotic system?
8. the tarantula's curtain grenades are misspelled as "courtain" also there description should read along the lines of "Throw a Curtain Grenade within Range 5. This grenade releases a smoke screen 3 spaces high in a line 3 path of your choice from its impact location. the smoke screen blocks line of sight but does not count as an obstruction" to be more in line with the ghengis's havok grenades and the napoleons stasis shield which act similar (also I added the part of it providing soft cover because the tarantula likes making soft cover but if you just want blocking line of sight thats fine to) also also most grenade systems have a thrown variant and a mine variant which I imagine the miasma grenade is ment to be
9. speaking of tarantula smoke shells is cool as a mech trait but maybye a bit busted as a system? especially considering it kind of hard outclasses GMS pattern-a smoke charges. I think this goes for Lingering munitions too considering the Ghengis's plasma thrower has an ability specifically to do this but is on a much smaller scale. perhaps allow the tarantula to create soft cover in this way if it uses it's core power, and then give it a protocol in it's core power that ends the effect but turns all of the soft cover made in that way into dangerous terrain, and then make jammer barbs a limited system instead? (this also gives you space for a new system)
10.the Shamat is a funny yoink machine, being able to drag your opponents into the abyss at mach speed is the type of ridiculous that I expect out of lancer. on the other hand I can't tell if I like the systems as much, I definitely think the Thrust Booster Heat conduit is amazing for maximum nyoom and the hull cutter definitely gives the "this is a repurposed enkidu" vibes the other systems have cool mechanics but for some reason it isn't clicking with me, but maybye thats a personal thing? I don't know it's wierd, feel free to ingore this part.
11. Lacewing......... *looks at grossly over-engingeered rifle with way to many components strapped to it*... yeh this ones good.
but I did notice the assualt kit has the free action boost as well, my boy the everest needs to eat too they already have sagarmatha,chomo, and now the gilgamesh to compete with all he's got now is his special sauce don't take that away from him too ):
12.Hihue, firstly being able to reposition is really cool and makes the railgun and several other ordinance weapons a lot more scary and less restrictive to use, the ability to choose between slowed and immobilized and getting bonuses based on that is great too, the core power i'm conflicted on on the one hand the bonus accuracy and damage based on what you chose is neat but I feel like the crit effect steps on the antlions toes feet things... a bit and makes it's big death shot feel a little less special?
13. ( ͡° ͜ʖ ͡°) your awesome and I hope this helps
P.S. I really like your lore writing and the lancer x mass effect fan fic