It's really good and a tough challenge. The endgame stuff cranks it up even further.
If you like all the parts of Hollow Knight - the exploration, the tough combat, the extended parkour sessions - and you enjoyed the DLC, Silksong is what you need.
If you're easily frustrated, don't like precision inputs, tend to think that games are cheating, or think you're gonna get through every boss with the same loadout without thinking about how you're actually going to beat them, Silksong is not for you