IMHO it's fantastic, my first goty candidate.
Not only it's gorgeous, it's way deeper than the predecessor while mantaining the same core idea.
Each play through feels much more like an adventure and the combination of all items (once unlocked) is staggering with a lot of possible strategies.
The game has much content as the final updated version of Card Crawl (quests and all).
Contrary to Card Crawl surviving a single game is not that trivial expecially in last castle.
Doing a high score is another story entirely.
While the concept is similar you have much more control over the luck factor.
I love it,