It is one of the most beautiful artistic expressions I have ever seen in a video game and it maintains this standard of quality the ENTIRE game, and in reality, it only improves. If you saw it somewhere and got interested, maybe it was by the graphics. But whatever, history is not the high point of this game. I find it very interesting the way the story is told, in that Dark Souls style, that everything is interpretive and in order to understand something, it really needs to be focused and pay attention.
Hollow Knight is the supermegapower implicit story of an insect and the world he explores. But I'll try to give you a summary of some aspects of the game. I do not know how to describe Hollow Knight the way he deserves it, and not even the way I would like it.