The appeal is extremely limited if you don't understand the specific references. The "polish" level is lower than major overhaul mods like Kaiserreich , focusing more on the joke than deep gameplay balance.
While it doesn't fundamentally change the grand strategy mechanics of HOI4 , it significantly alters the visual and narrative tone of playing as Finland or involved factions [2, 5]. The "Solid Review" Iivo ja elmo.hoi4
If you are looking for a serious historical simulation, this isn't it. However, it excels as a "shitpost" mod. The appeal is extremely limited if you don't