Ok, great start to a great game!! As with many reviews Ive read, people are impatient and dont take the time to learn the controls so they pan the game. It took me a while too but now I can jam on the "difficult" level.
Just a couple of suggestions and then you should start selling this app, not giving it away! First, the enemy should get fewer in number the more you kill. In some instances you hit one and you get a "kill" but he pops right back up in the exact same place. Thats unrealistic and not that satisfying. Second, all the targets seem to be spread out along pretty much the same band width across the horizon and it would be better if they were up and down and all over the screen as well for more variety of aiming directions. That would be more challenging and more interesting.
Thanks for a cool game. Make these changes and Ill buy the upgrade!!
saintofcircumstance about Shooter X1