I just got my kickstarted copy of this game and, after perusing it for a few hours, I highly recommend looking into it if you're a Howard/Conan fan.
It's heavy on old-school crunch and fluff, and quite free of PC nonsense (There are tables to generate unique physical characteristics for the men and women of the richly varied Hyperborean peoples.)
The system is d20 with descending AC. There's no THAC0, but a matrix instead or you can just memorize the formula. There is a declaration phase in each round of combat where PCs and NPCs state their intent for the round, one of the few games that I know of that does this. Declaration is done prior to rolling initiative, which is also rolled each round and is side-based. There are several pages of optional combat actions beyond what you typically find in d20 systems, such as horse charge, and a what looks like a decent set of brawling rules.
There are 4 classes (fighter, sorcerer, cleric, thief), which are quite are distinct. There are 22 sub-classes that add subtlety and blur the lines between main classes.
The Referee's book has a lot of setting detail, advice on running long and short campaigns, treasure tables and magic items, as well as a respectably large bestiary.
Anyway, that's my first impression. If you have it or play it, share your thoughts! Or if you have any questions, I will try to find the answer (still reading through the books).
Here's the publisher:
https://www.hyperborea.tv/