The only thing that was a bit confusing to me were special variants of - i think - every ship, that has a wasp drone fighter bay, and nothing else compared to its standard variant.
For someone with lame gpu like me, i think this spends a lot of memory, and the the blueprint list when you open ship production page looks almost bugged with how every ship is doubled:
shipA (SP)
shipA (SP)
shipB (SP)
shipB (SP)
(...)
Personally i'd remove all those as they are pretty much same thing as their normal variant (probably also makes battle laggier if you for example take 20 small ships with wasp x6 each); and normal ships are already good as is.
On the topic of keycards, i tried one decently long playthrough to the point i've become god in game, and i've found about 4+-1 keycard in total. IMO, considering how few of them i got, i didn't even notice there is rarity system behind them until i took a look into graphics folder. Maybe it's just my luck though
I'm not sure what others think of it, but i found the weapon names a little bit complex, it takes a while to find what youre looking for considering how there are double, triple, quad barreled weapons, AP/HE, torpedo with/without shield. Compared to vanilla weapon names at least, such as Arbalest cannon for example.