The atmosphere in this game is phenomenal. Genuinely one of the best I've ever experienced, with the emotional piano OST and beautiful weather effects. You can actually feel the gradual progression of your character and environments changing, and it's incredible.
I'm not usually a fan of metroidvania games, but I ended up enjoying all aspects of this game. Yes, it's souls-like, but you don't lose anything everytime you die. You also get to freely experiment with tons of abilities throughout the game as you clear more bosses. Despite some difficulty spikes with certain fights and areas, I never felt too frustrated or as though something was overly cheap. I'm not going to pretend every area or boss is perfect, but I do think they did a relatively good job of balancing things and keeping the gameplay smooth and fluid.
Seriously, just buy this game when it finally comes out on GOG and try it out for yourself (if you don't mind a bit of difficulty to reach some amazingly breathtaking areas).