Having played around with the mod for... around six hours or so, i've noted some things:
firstly, both the ships and weapons the swarm has are hillariously strong and many are overpowered.
Highly accurate, extremely flux efficient, highly damaging projectile weaponry, backed up with infinite ammo sabot-esque swarmer kinetic missile launchers, equipped on ships that are both durable and often using very strong abilities (like the temporal field ability) for an OP cost often comparable to weaponry much weaker than the swarm's equipment does not necessarily make for a balanced faction.
which, you know, if you want them to be a lategame esque enemy faction that's fully understandable.
however, the addition of having them launch full invasion fleets into the core kind of puts that concept into a tailspin, as this results in the player encountering the bugs very often, and very early - especially given the efficacy of their invasion fleets, of which there are extremely many, and they very often succeed.
i've played just past one ingame cycle, and have reached the grand level of 5 - and so far there's been 2 successful invasions(cibola and Salamanca), one failed(sindria), there's 2 more on the way (gilead and ancyra) along with a saturation bombardment headed for Madeira, alongside numerous raids.
out of all of these, there was not a single one ranked below 'superior' in terms of swarm vs defender strength, and sindria only won on the ground.
this intense aggression leads to the player encountering the swarm very often - and unless the player gets both very lucky and plays incredibly well, they will not be able to stop them before they make massive inroads into the core sector systems.
while i do absolutely love the concept of this mod, it feels a bit too imbalanced - and if one wants to keep the power imbalance, maybe instead of superior ships and firepower, they'd simply have much more ships than the opposing force? a change such as that would both make sense given the swarm moniker and style, as well - to draw from history, making them the shermans to the player's tiger tanks would feel very fitting ("a German Tiger is easily worth 10 shermans, but they always had 11!").
the sprites also look a bit... fuzzy, compared to other ships and equipment in the game - but only some of them. iunno if that's just my install.
in short:
really cool idea, but the bugs are pretty overpowered and would probably need some work on that. sick mod though, definitively one to keep an eye on.