Kind of disappointed.
The graphics are awesome, the accelerometer controls are smooth and easy to set up and it's kind of fun.
The game actually scrolls. You just fly straight through the air the whole time. The shooting isn't much better... All you have to do for a lot of the targets is simply aim the sight reticle at them and it auto locks and auto fires for you. IMO that's not very interactive. Some of the other targets you actually have to push a button on the right side of the screen while you're locked on.
It's not that bad, and I'm sure some people will like it, but for $8 I feel kind of ripped off. 2 of the 12 advertised levels are tutorials. I beat the two tutorials and the first level in about 10 minutes.
So here's my breakdown:
Graphics: 8/10
Sounds: 8/10
Controls: 8/10
Gameplay: 5/10
As you can see, I find the most important part, the gameplay, needs the most work. IMO not worth the $8, but I suggest you wait for some video reviews if you are still on the fence.