No ads, no permissions beyond file storage, no issues working offline.
But you can't buy that anymore; now the only option is a 'free' version which has ads that you cannot pay away.
Fortunately I can still download the old version from the app store; now it is called 'zzSUNSET <game>' in the list of purchased apps. But I'm amazed at how consumer-hostile game companies have gotten; I guess the ads must pay out the wazoo. It makes me really hesitant to try any new mobile game, especially since I don't really have much time for them these days. I'm not going to spend 30 seconds out of every 1-5 minute diversion watching an ad, that's ridiculous.