This is a must for all metroidvania lovers! I'd say it's in the top 3 best metroidvania games of all time.
Fantastic art, huge map, a lot of secrets and mysteries. You have so much to do with exploring and dealing with challanges that it will take you about 30-40h in the first playtrough. The game is pretty hard at times and the combat mechanics could be a bit better but it's decent enough. The game also has some great lore which you can get from exploring the enviroment or talking to npcs.