A perfect take on the genre
Hollow Knight is the true modern metroidvania game, it's fresh, with really tight controls and it gives that atmospheric sense just like Super Metroid at its time. It's not hard to get lost in this dark world, full of intriguing bugs and curious places. The game is so rich in content and unexplored lore, the deeper I went into Hollow Knight, the more I was surprised at just how much content and freedom it has to offer.
The main hook of the game is the traditional way of the genre: New movement abilities allow you to move through new paths in familiar terrain, giving the obligatory need to retread old ground fresh life. With all abilities and areas having so much personality.
The combat is fluid and really strategic, the boss fights are one of the best I've ever seen in any video game. The game also has the souls like death system, it's really really challenging, and if you die you have to go back to your body so you can recover your currency.
It's not for everybody, but I love this game. The devs already put out 4 DLC's, all for free, this game is really worth the price.