Castlevania series. Masterfully created by Shane Gill for his PixelJoint page (and spotted by the folks at Tiny Cartridge), the piece is the living embodiment of what we wish the DSiWare service played host to more often.
Alas, we don't believe we'll be seeing "Mansionvania: Vacuum of Sorrow" landing on Nintendo's digital distribution service anytime soon -- but we can at least point to it next time someone asks what we'd like to see available for download. "That! Go make that! That 2D pixel game with the vacuum-wielding Luigi! And enough with the calendars already!"
[Via Tiny Cartridge]