Step 9: Tile Editing: Expanding the Design
Once you've got the basic level down, try imagining the gameplay flow. In this case, the player is pretty free to move around. Now unless you already have done, you'll need to decide whether you want to restrict/direct the player's movement, and if so, whether to do that with tiles, objects, or both.
Here, we're going to use a combination. We'll start by adding some horizontal channels to direct the player, and provide some options for how to traverse the columns.