Yes, that nefarious Cave Story clone. But a clone of something is awesome too. Doesn't matter. If you like paltformer, and well done platformer, and cute graphics, you should check out:
(http://i430.photobucket.com/albums/qq22/mywarehouse/tusprite.gif)
THE UNDERSIDE (http://www.insignificantstudios.com/)
I recommend you try this. It's really great.