I want to say I love your game but I can't! There are definitely things I love about it. If you fix things I could absolutely see myself playing it and recommending it. But right now as it is I can't.
First off there is no auto or manual screen rotation. What's weird is some screens like ads do auto rotate while the main screen doesn't. I am forced to play with the home button to the left and it's not good. This is a basic feature that should be implemented.
Next is all of the upgrades are done and purchased using in game currency that are given out using consumable in app purchases. These purchases cannot be restore. There is no iCloud account back up. If I break my device or upgrade my device I'm screwed. I will lose all my money. That's not right. You should provide in app purchases that can be restored such as currency doublers. That can be restored with a button so that I won't lose my real money.
If you address the above issues you will have a great game that I will be happy to make a purchase in. I love how you inplemented both touch screen and tilt controls. I love the graphics style and the gameplay is intense. Please fix the above!