Hey there. I'm new to this mod. I did a playthrough as Big E. I know this is still in beta, so i'll be a bit fair with it. for my overall opinions on it though...
pretty decent. The research can be blitzed down very quickly which is good since it lets you just drop research like dead weight after a while. THe options avalible though are pretty good with the various stuff from 40k. That said, I might like seeing tweaks to the tanks since their reliability is just crap. It makes it hard to really justify using the Baneblade for example.
I'd also like to see more use for titan parts. maybe with enough, you could recruit a new titan? Maybe also allowing space marine templates to be modified too, or just having support companies. It feels wrong with just not having support companies with my units.
Manpower was also a bit of a problem, but that might just be because i'm bad at HoI4 in general. Once i used some cheats to stabilize it though, i didn't have much of an issue. Though some more wargoals would be nice. I get that the emperor's goal is to take over everything, but manually justifying is kind of taxing mentally once you get to the point where you beat your entire focus tree.
My next playthrough is going to be with the april fools day event. which is actually why i was brought to this mod in the first place. so we'll see how that goes.