Ninja Theory hit all the marks, and deserves all the allocades for creating this work of art.
Above all else, Hellblade, Senua's Sacrifice is an experience. Those that love an immersive story and setting will thoroughly enjoy Hellblade. Those that are looking for an action hack-and-slash will find something here, and if you're looking for more of a puzzle-game, there is something here, too, but Hellblade is a concert of these things and so much more.
Distilled down into its basics, Hellblade is an over-the-shoulder-third-person action game where you explore areas trying to solve a puzzle to progress forward to the next area, and each area-puzzle has a theme that fits with both the setting and the narrative of your character's (Senua) progress. Phew! That's a lot to say and take in. Furthermore, these areas are peppered with combat encounters. Permeating all of this is the knowledge that Senua has visions and delusions, so her quest is as much allegory and spiritual as it is literal.
Some complaints about Hellblade may be that the types of enemies are limited, and, similarly, the kinds of puzzles are limited, too. This can be considered true, but the enemies and puzzles you encounter in the game are fit to the theme of the narrative, and while the variety may be lacking, the game still does a good job of increasing the difficulty of what you encounter throughout the game - in other words, it's properly paced.
If there is something that the game actually can be marked down for it would be how, when surrounded by enemies, they don't necessarily behave as they should - rather than all trying to attack at once, it will be whatever enemy you are focused on that will primarily attack, while other enemies will not attack as often as they should. This "feature" is one of the downsides of a game designed for cross-platform, a condition sometimes perjoratively labeled "console-itis."
Overall, Hellblade is a well-designed game providing a rich experience - try it!