I really really like it, and I've been playing it in my learning language and I've learned so much from the rich dialogue and story elements.
Its in the same vain as hollow knight in terms of tight controls and skill based combat, with aspects of exploration.
I say this as a person who is not a fan of metroidvanias at large, nor dark souls games, but I'm a huge fan of souls-lights.
I seem to have boomered a reply to someone else asking me how I like 9 sols...