Mr.Danger Seriously flawed
Before I get to your game's game-breaking flaws, i'd like to respond to your request that a previous reviewer tell you how your game is "unoriginal." Several games already use the draw-ground mechanic. One is a game you made, and the other is kirby: canvas curse. Therefore, this game is indeed unoriginal.
Now to the game-breaking flaws, and I sincerely hope you read this part. If you draw really fast, you can almost fill the screen with scribbles. The magic sand bar or whatever it is, doesn't take drawing speed into account. This makes the game way too easy to the point of boredom. I never run out of sand and I never have to use platforms.
