Design a simple android game using Unity 3D

Design a simple Game with two scenes - Main Menu and Game Round. Main Menu will have 3 options - “Red”, “Green” and “Blue”. Choosing any option will change the colour of the background in the Game Round to that corresponding colour when it loads. In the game round, there is a rectangular gun. The gun aligns itself in the shooting direction. There are three circles/spheres coming down from the top - each has an alphabet on it. You are supposed to hit the correct alphabet coming from top. At the start of the scene, generate a random question from a pre-defined list of words. You are supposed to hit the characters based on that word. On the top right of the screen show the number of times the game h as been played so far. To do this, write an entry into the registry, and take them out when the game restarts.