Cave Story 3D

From publisher's official website: Cave Story 3D is a side scrolling action adventure game inspired by the fan-favorite 2D original. Now in a full 3D world, Cave Story takes the proven 2D action, exploration into stereoscopic awesomeness. You wake up in a cave with no idea who you are or where you came from, but you know you must help a cute race of rabbit-like creatures beat the crap out of some crusty old doctor.