First: Thanks for launching on WP8 - I see you've already launched it on other platforms so hopefully adding WP8 to the mix was relatively easy.

- your app is currently using the default Unity logo in the app listing once a user downloads it so you may wish to add your own logo there instead. - the game itself feels sluggish even when used on a high-end Lumia 920 - I'd check out any optimizations that could be made as other Unity games run far smoother - the gameplay is entertaining but you may want to add some pickups such as missile-armour or 5sec invincibility, etc as the rockets are very difficult to avoid