Slain! is a 2D platformer with old school graphics and metal soundtrack. The game has been developed by Wolf Brew Games and was successfully Kickstarted a year ago.
Game's description from Steam:
"A heavy metal inspired combat with puzzle elements and gore galore. Stunning visuals and true old school gameplay with classic arcade combat accompanied by the most metal soundtrack you've ever heard."
You can get more information as well as buy the game here (Steam link).
Castlevania gameplay with classic metal! Here you go: