Using the level editor, you can easily design levels for Platformers and RPGs using Tynker. Tilesets and artwork are provided for both top down and side-scrolling games.
In addition, when you drag characters from the Level Editor on to the Stage, they are pre-programmed with default behavior. Tynker has Platformer and RPG game libraries built-in so that you can build your games easily. You will see the Platformer and Top down block categories once a character is dragged onto the Stage.
Watch this video that teaches you how to build a Platformer game.