To play the full game with all the assets, click the "Play now!" link below.
1. Have Unity installed (free or pro)
2. Unzip the file
3. Open "Assets/SceneMain.unity" in Unity
4. Press play
Note that I've removed 2D Toolkit plugin, some sound effects and both the music files from the source files. The characters are drawn only as cubes and the rest of the game's graphics cannot be seen.