Ori series, specifically Ori and the Will of the Wisps. It's my absolute favorite game of all time. It's got the amazing visuals and insanely good OST, crisp and satisfying platforming and combat, engaging and unique bossfights, incredibly gripping story, good difficulty settings and going for 100% is rewarding and not nearly as annoying as in many other games. While it may stray a tiny bit from the classic Metroidvania formula I think it still does it incredibly well.
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