Well, I bought it, runs well on and ipod 4. Crashed once exiting the story scene after finishing level 20.
Controls well and visuals are pretty good. Music gets old fast.
Currently 44 levels in the game(Purgatory and Hell). Four of those are bonus levels unlocked by rating the app and liking on Facebook. The bonus levels are unlocked when you click either option so you don't actually have to rate or like.
Trying to go to Heaven levels gives you a message that they are coming soon.
Now for the big question, is the game fun? Honestly, for me, not really. After a while I gave up trying and started randomly shooting until hitting the correct angle to finish the level with 3 stars. Currently stuck at level 21 and I can't say I care enough to return to the app.
I think the dev would have been better off making this game free with ads.