Insanely Twisted Shadow Planet is described as 'In this 2D action adventure so damn twisted, explore unique environments and battle bizarre creatures as you make your way to the center of the mysterious Shadow Planet! Solve complex puzzles and upgrade your ship with alien technology as you fight to save your home world'. There are more than 25 games similar to Insanely Twisted Shadow Planet for a variety of platforms, including Windows, Mac, Linux, Steam and iPhone. The best alternative is Limbo. It's not free, so if you're looking for a free alternative, you could try Cave Story (Dokutsu Monogatari) or Alex the Allegator. Other Insanely Twisted Shadow Planet like games are Braid (Paid), Inside (Paid), VVVVVV (Paid, Open Source) and Super Meat Boy (Paid).
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.
Capsized is a retro-inspired 2d platformer developed by Alientrap. Presented in a unique hand drawn art style. As a intrepid space traveler, you have crash landed on a mysterious planet and soon discover you are not alone.
Welcome to the Minilens experiment. A thousand years into post-apocalyptic Earth, many forms of life have gone extinct, including humans. An alien robot series, called Minilens, is cleaning up the Earth and collecting the surviving flora for research purposes.