Cave Story+ was created and published by Nicalis, Inc.
Cave Story (Doukutsu Monogatari) was created by Daisuke Amaya / Studio Pixel
Buy Cave Story+ on Steam here - http://store.steampowered.com/app/200900
Download the original, free version (for Windows in a crapton of languages, Mac in English or Spanish, and Linux in English) here - http://www.cavestory.org/downloads_game.php
Cave Story is a 2D platformer, sometimes called a "Metroid-Vania shooter" made in 2004 by one Japanese man. Distributed freely, it became a cult classic, eventually getting a published release on WiiWare, DSi, 3DS and Steam.
To anybody who loves platformers, I highly recommend it.
