Couple of updates:
1- I updated the shader and now “Toon4” is the latest and has a proper outline and texture and bump mapping. I have applied it to the enemy object. Since the objects are small it does not made any significant changes but I should play with it more.
2- I am trying to put good music on the game. I found some music and little sound effects. Since I am not expert gamer it would be great that you guys give me some suggestion about the sound effect and where you think it needs sounds.