Cave Story is one of the best (Single Player) games I ever played. I brought it for the Wii years back, and really enjoyed it. I got the freeware version on my PC, beat it again, and enjoyed that too. I even played it on my Android device and enjoyed beating it there as well. When I seen Cave Story+ on the market on Steam, I felt like I HAD to add it to my Steam collection by buying it, because, anyone whos finished this game and enjoyed it, can definitely say it deserves a buy. Multiple endings and a fair yet challenging general difficulty is more to ask for in a 2d shooter platformer, it even has extra content and loads of achievements.