This game is a blast. I've played it for a few hours, finally beat it earlier today, and will be embarking on hard mode soon. I love just about everything about it. Makes me wish they make more new side-scrolling Castlevania games of the old style.
I love the arcade- and Sega Genesis-style music. The graphics look very reminiscent of a Game Boy Advance game, which isn't bad, but I'd prefer if it were more up to Super NES or Nintendo DS quality. Still, way awesome.
Although, aside from the fireball-shooting whip, and the rolling eyeballs, I'm confused as to why it's called Castlevania: The Adventure ReBirth.