2D TopDown Plateformer is described as 'This editor contains many characters parts, unique tiles, bridge, multiple levels, 2d lights ... and many more'. There are three games similar to 2D TopDown Plateformer for Linux, Mac, Windows, Online / Web-based and Steam. The best alternative is RPG Maker. It's not free, so if you're looking for a free alternative, you could try Dot World Maker.
RPG Paper Maker is a free game maker engine including a 3D universe with many 2D sprites and some simplified 3D objects. Pretty close to the RPG Maker series, RPG Paper Maker finally give a way to create RPGs in a totally 3D universe as easy as it is in 2D!
We wanted to create a new role playing game which would offer multi-player experiences and runs within the browser and we didn't found something which fit our needs we started to build it up ourselves and decided to open it up to others as well.