BloodRayne: Betrayal
Great Castlevania-like gameplay with a twist. You have blades and a various projectile weapons collection through the game. You can also sap blood from enemies to refill your health, and you'll need to, believe me. Be warned, this game is challenging.
Malicious
Plays much like a Mega Man game in concept, except rather than slogging through a huge stage to get to a small room with a boss, they throw the boss into the huge room and you duke it out there. After each battle you gain an ability or weapon type that you can take into the other battles. You're also ranked on each battle so there's some great replay value if you want to strive for that S rank.
Moon Diver
Often called a spiritual spin-off to the Strider series. This game really shines in it's coop play in my opinion. You can play up to 4-player online coop slashing through stages and bosses with team up attacks which amplify the effect of the skill for every character participating. It's great fast paced hack and slash fun.
Soldner-X Collection
Fans of horizontal scrolling shmups like R-Type and Gradius will feel right at home with this. It's not up to the same calibur, but if you're itching for some new shmup stages, I think it's worth the price. Fun fact: strangely enough these two were done by the team behind the recent SRPG 'Rainbow Moon'.