tldr: it's aight
Only knew 3 of the properties featured which honestly made me enjoy the story a lot less since most character development can be summed up as truncated versions of their character arcs from their respective shows. There are also frequent loredumps about how concepts from different shows interesect and honestly my small brain couldn't handle discussions of how Getter Rays affected the the world of Evangelion or how Super-Robots were popular before the mass produced mobile suits for long periods of time. If this crossover fanfic type stuff sounds interesting, it's probably up your alley. I'll say that I did enjoy the original characters the game introduces and feel interested to check some of these shows out.
As for the gameplay, it's an alternate universe Fire Emblem where every character is in an offensive class with a 1-4 range. Your units are honestly really overpowered and you can snowball extremely easily. The real source of difficulty comes from the objective-based difficulty system. Early on, they're easy to complete but some of the later ones might require retrying the maps multiple times (which I did not).
It does run a bit too long.There's 50+ maps and the story has alternate paths you can take and a few secrets (check out a guide to get them) so to really see it all, you'd have to get a second or third playthrough going.
Personally, I did like playing through this but was also rushing to get it over with towards the end. It'd probably be a 3.5 but by the end I was kinda able to follow the plot again and starting enjoying it more.