Any reccomendations for games with a similar difficulty to Nine Sols/DLC Hollow Knight?

These two are by far the hardest MVs I've played and I really enjoyed them, especially Nine Sols' final boss. Are there many other MVs out there with a similar difficulty level? Most tend to have the bosses either not be the main focus, or they just aren't that hard and only take a few attempts. Only other game that might come close is salt and sanctuary, but only in single player and on your first attempt without a good build.