Ori + its sequel are not on the same level as HK, in my opinion. The combat in the original is really bad/way too easy, and the exploration is just okay. The sequel drastically improved the combat, but the map is significantly worse; it's essentially just a "hub and spoke" where you go to one of 4 (IIRC) separate disconnected areas, grab the powerup which does more or less nothing in the other areas, use it to finish the area and beat the boss, rinse and repeat until the finale.

That being said, they are still very good games; excellent atmosphere, artwork and presentation, some genuinely haunting, creepy, and awe-inspiring areas. But I think Hollow Knight is a tier above them.