You know? I had a feeling... Like I thought "maybe later it's not this easy, maybe later it's well done" but it died right after I... "won"... it finished there, after three very simple and very poorly designed puzzles.
Advices for the next one: (because I like where you're going, sadly this is not close to that, but it wants to, and it's enough.)
Music and sounds: Add them, add good ones (like the one you used, it's very good), and don't forget to put a mute button. Without it, it looks more like a coding experiment than an actual game.
Limits: don't let the player go outside what's seen on the screen, easy to get lost and quit.
Physics: the last stones puzzles was bad designed, after pushing a stone against a wall, there's no way back.
Buttons: Needed during game: a Main Menu shortcut, Mute, and Restart Current Puzzle.
Diagonals: Let the player walk in diagonal, it's intuitive and player-friendly.
Work more on the puzzles. A LOT more, and don't make them just because, you'll have to justify them.
Don't know what else, read more about programming games... Maybe another software, and not Stencyl, I don't know, I don't know about those things.