How can I save position of sprite in webstorage, is it possible? So it's in the same place when user comes back to the game, until he or she movies it again.[/QUOTE]
You have to set 2 keys: "PlayerX" and "PlayerY" for exemple, in the local storage, set to the player X and Y respectively
then when you load the game (conditions of your choice, a button maybe), you begin the layout, and at the start, you set the X of the player equal to int(WebStorage.LocalValue("PlayerX")), and for the Y, the same but with the Y
the manual should help you too:Webstorage
Game design is all about decomposing the core of your game so it becomes simple instructions.