I'm not a fan of the virtual controls. Too bad because it shows a lot of promise. At least I'm only out $0.99.
I've been really enjoying over the last couple of days on my iPhone 6 and iPad Air 2 - and no crashes for me so far.
AFAIK crashes only happen on the 4S due to low RAM specs, but on the rest of devices it should be okay.
I suspected it was something like that. All you can see in the reviews is loads of people complaining about crashes without saying what device they've got so it's not much use.
I have a 4S and an iPad 3, and CounterSpy works as charm on the iPad 3, but on the 4S it's crash-ahoy. That's why I know for sure