Back in 2014, Life of Pixel released on Steam. This platformer was unique in that it took players through gaming history. Now the developers are empowering everyone to create a game.
Platform Maker is akin to Mario Maker, but without all the objects being Mario-related. There are tons of block types, drag and drop tools, and the ability to change between different console style looks (such as Game Boy, SNES, etc).
Once you’ve created a great level in Platform Maker you’ll also be able to share it online. Interested creators should definitely check out the Steam Greenlight page for more information.