for the love of god ignore Miriam's challenge rooms, those things show just how poor the mechanics of the game are for these kind of challenges, they are not fun at all.

But aside from that, the game plays well with it's more combat focused mechanic, and it is really well level designed for how "heavy" the jumps feel... wait... heavy-feeling jump, insta-death spikes... is this Mega Man but metroidvania and with a sword?

Also, the boss battles might be simple, but the atmosphere is what makes them great, and with how combat focused the game is, the battles feels extremely fun.