Umm, here is my game. It's about an alien because the art assets were free to use, haha. You can play a mario-type level in the arcade.
http://www.scirra.com/arcade/addicting-example-games/11921/platform-adventure-demo
World One (Forest themed of course)
Preview of World Two (Coming along slowly)
Develop games in your browser. Powerful, performant & highly capable.
Update 4/22/2014
-Added two playable levels.