Of Light & Shadow is described as '"Of Light & Shadow" is an award winning sidescroll puzzle-platformer for PC/Mac with a slight twist; the game combines two areas in each level, light and shadow, as well as two protagonists in one playable character, Mr. Light and Dr. Shadow'. There are more than 25 games similar to Of Light & Shadow for a variety of platforms, including Windows, Mac, Linux, iPhone and Steam. The best alternative is Limbo. It's not free, so if you're looking for a free alternative, you could try SuperTux or Cave Story (Dokutsu Monogatari). Other Of Light & Shadow like games are Braid (Paid), Hollow Knight (Paid), Ori and the Blind Forest (Paid) and Alex the Allegator (Free, Open Source).
Cave Story, or Dokutsu Monogatari, is a Japanese freeware Metroidvania side-scrolling Metroidvania platform-adventure game developed by Studio Pixel . It has been translated into English by Aeon Genesis Translations.
Alex the Allegator is a series of games that I, Johan Peitz, usually use for game coding challenges like Speedhack and Ludumdare. Whilst most of my games reside on Free Lunch Design, this is the place for the Alex' series and the even the source for these games. Let's go! Represent entire series of Alex the Allegator games including Alex the Allegator 1, 2, 3, and 4.
Super Meat Boy is a platform game developed by Team Meat and is the successor to Edmund McMillen's and Jonathan McEntee's flash game, Meat Boy, originally released on the Newgrounds website in October 2008.