It's fine, its like any other merge mobile game, trying to get money outta you with nice simple but pleasing gameplay, it has a strong 'if you wait you'll get progress' backbone which is I feel the thing that makes a mobile game 'money hungry but not evil' and in a modern games industry where making money is mostly the goal I can respect a game that has a balanced approach to trying to tempt money out of you.

Obviously it has the same issues any game hoping for whales does but again not trying to take a stand against an embedded unethical practice here.