I really love how the game was created. Also, the stages of "development" would help out alot on my game, or others games, for they tell you exactly what you're ascending to, and then to look at the outcome, see what the optimization has done to your project. I'm not sure if I can see anything to be improved. Well I actually think you should add more enemies in the final project. Overall, the game is awsome! It's addicting as well as informal.
Best Regards, Awi