The similarities to Hellblade are imo only skin-deep. And regarding the Norse mythology setting: As weird as it sounds, God of War is also so much brighter, vibrant and fantastical in it's Norse mythology setting. Many don't know how fantastical Norse mythology actually is, it's where the fantasy genre stems from after all. When most think about it, they think of icy fjords, snowy woods and vikings. They'd be amazed what they actually find in Norse mythology and in this game.
I haven't played the most recent Tomb Raider games, so I can't say how close they feel to this God of War, but I am very surprised not more are picking up on how similar this game is to a 3D Zelda (excluding BotW obviously). The director even stated that in one of the early interviews about the game. As I mentioned earlier, the similarities are strong and imo stronger than all the other names thrown around, like TLoU, Uncharted, Bloodborne etc.
You'll explore a vast fantasy world, you meet different cultures/races, you fight and puzzle your way through big dungeons, you go against mini bosses and big bosses, you go treasure chest hunting, you upgrade your weapon and gear to be able to progress further and reach locations that were formally closed off to you, you travel a lot back and forth, instead of heart pieces you collect Iðunn apples. If you collect 3 of a set your health bar increases. It's literally a mature 3D Zelda with more focus on in-depth combat, better side quests and a better story.