First off, THANK YOU SO MUCH for making this OS4.0 available! I've really been wanting to play this since you've incorporated swipe controls!
Now for my review...
This, along with Phoenix, are my two favorite shoot-em-ups in the appstore (that run on my 2nd GEN...) ISUD is pretty decent as well... but I'm getting off topic...
With the update, adding swipe controls, a point system, lives... this game has become VERY playable. And VERY challenging! I've just scored 6,000,000+ in Phoenix, and I can't get past Act II in this game. Having difficulty settings is kind of pointless though. The enemies are not harder on "hard" or easier on "easy" - on hard, you get two lives, easy = 6... or 7... but there's no change in actual gameplay. If in hard mode you made the enemies shoot faster, or more projectiles, that would make this game A LOT better!
That being said, this is still a 5 star app, especially at 99 cents. The frame rate is solid (even on my 8GB), the graphics are pretty decent (the enemies pink ball projectiles look kind of fruity... but in Act II, some of the enemies blue+grey/silver projectiles look pretty bad@$$... hehe), I don't see anything about Retina Display in the description, so I'm guessing it looks the same on newer generation iDevices... but it's also never crashed, and given me hours of entertainment.
Thank you for keeping with this game, and planning on making updates and changes to it in the future. Can't wait! =o)