Base Game Engine for Mobile devices using Unity..

I'm looking for a base game engine similar to Stupid Zombies with at least 2 levels. You will use place holder graphics. This means create and place holder graphics. Its for mobile devices and should work on iphones, androids and tablets.. Resolution of my own graphics and your screens should be based on retina display and scaled accordingly. Make prefabs, sprites, where necessary and I will then modify. The graphics are just PLACEHOLDERS and can be as ugly as needed. I don't care... Look at the flow of this game and this is what I need. 1) Logo Scene show and fades out 2) Menu Scene with play button, pressing on play button will slide into Stage Scene 3) Stage Scene, Scroll view slide affect back and forth to stage selection, back button... Create 2 Stages so you can show side affect. Pressing on a stage will slide into Level Scene. Will show graphic text of how many levels passed out of all. 4) Level Scene, Scroll view affect with about 2 screens to scroll through, show 15 levels screen, first one unlocked rest locked Press on first level it will show loading screen. A passed level will show how many stars you got, similar to the SZ game. 5) Game Scene, Restart button, You will have a character with a gun, pressing anywhere will shoot bullet. It will bounce on all side. Also it should take angle into affect when bouncing off. Put a platform and a enemy on it. If you shoot at platform, it will bounce off. So make these type of objects a prefab. Make a enemy a prefab. Clicking on holding down on screen will show a cross hair with a red path. If you mouse up, it will fire... make the bullet trail affect.. Once it hits enemy, it will go into an enemy die animation and it will popup small text saying boom. if all enemy dies, you passed.! Also there will also be a bullet count on bottom.. You only have a specific set of bullet you use them up you need to replay. Click on screen will say out of ammo. and a restart text will appear... Passing will show stars and level complete... Make at least 2 prefab enemys... Save and preserve state, so now going to level selection screen will show level passed and second level is unlocked to play... Basically take a look at flow of SZ2... and use it as a base. Use prefabs where necessary, use sprited animations. etc. Thanks