Castlevania games that have a somewhat Metroid feel. Exploring, platforming, etc.
Frankly that term annoys me. As an avid fan of both Metroid and Castlevania I can tell you they're very different. Metroid is dark, ambient, and very alien. Castelvania is gothic, upbeat, and more cartoony (particularly the newer ones). Sure, they're similar, but the universes are really quite different.