The game felt too sluggish with the constantly bad framerate. On top of that, I had a definite issue with the combat in that it took about 20x the amount of hits to kill bosses/tough enemies, and about 3x too many on standard enemies.
That, and horizontal attacks are a big WTF in a 2d environment. The game feels ham fisted, and it's a shame, too. The environments are glorious, and it looks like a proper castlevania (no, I don't give a shit whether it's metroidvania/classicvania.). Music, however, was a let down.
@mrbalmer: Mario 1 can be beaten, no warping, in under 30 minutes (if I'm not mistaken).
However, I've gotten many multiple hours out of the damn game. I definitely understand wanting to get your money's worth out of a game, but Length =/= value. Especially when we're just discussing length from first start to first finish.
Not complaining about your post, I just want people in general to reconsider what they look for in games, even if in the end they still favor length.