I made many examples crammed into one game while using the free edition. Now that I have an Indie account, I can make these into actual games. I made 4 example games and they all can be found in the first one. These levels try to show how to use these and how they are coded. Mess with the coding and make sure you understand how it works, refreshing the page will reset the game.
Semi-solids show 3 different ways to make a semi-solid platform and
Jump meters show 3 different ways to make different jumps.
The shop shows how to make a proper shop with saves and
Checkpoints also shows how to use save but as a save state.
Semisolid Platforms: http://www.flowlab.io/game/play/1060081
Jump Meter examples: http://www.flowlab.io/game/play/1186457
Shop example: http://www.flowlab.io/game/play/1186462
Checkpoint example: http://www.flowlab.io/game/play/1186464