Yup that is a great game. That added mode basically makes it like an entire sorta new second game that's a spinoff sequel to Castlevania 3 back on the NES. You again have a Belmont, a Belnades, and Alucard with the basic same concept moves... just lacking the stupid pirate Grant.
That is the ONE castlevania game on NIntendo handhelds that is more than worth the price of admission as it's like a 2 for 1 deal. Damn shame they had to go and fuck the second one up so bad only the most clueless or hardcore denial CV fans can tolerate that shat.