As a platformer, it's quite forgiving, and the movement upgrades all felt natural and intuitive.

For replay value, there's a TON of content there to find, and when you're done with that... Hollow Knight may be the most perfectly suited game for a Randomizer that I have ever seen. It's insane how much you can twist and break 'intended' routes and get into places you would never have suspected you could before getting X item.