Not worth it
I had some issues when I first started the app, including a few crashes. After that, I had to figure out some of the mechanics myself, as its not a super-intuitive design. After spamming a boss fight for some upgrade coins, I got stuck on a level with no instruction. The difficulty curve is somewhat ridiculous, to say the least.
All in all, I figured I could be generous and buy a new app to try, as it got featured on the store. I regret the decision, even for just $1.99, and would love a refund, even if Im sure they wont offer one.
stanlry about
Aces of the Luftwaffe