How do I make tileBackGround both sides?

first, please play this game.

api.flarie.com/api/games/belfry

Now, you see when the object doesn't exactly meet together how the object is cut.

have you any idea how to do this?

my idea is to use tile bakground and cut it, but that works only for right side of tiledBakground.

Do you mean like in this demo: editor.construct.net