You can use tools like mt Paint, Inkscape, Pencil, to make your own graphics for the game :) The music doesn't seem to fit with the visual style of the foreground graphics. Perhaps think 8bit chiptunes or future synth-type tunes. For sound effects, you should check out sfxr.
If you make it an endless runner, where the platforms move and the player has to keep up or die, it might add a funner dynamic to the gameplay. Include a leader board or high score board of some kind, and I think you might get more players and more positive feedback.
Change the main character to something unique, and animate it so that it looks like it is moving forward. Cute first effort with Stencyl, but try adding your own little unique gameplay hook. It is one thing to use templates and examples from other people, so that you learn, but you should always try to add a little something that your game has that others do not.