Thanks for the post, gonna go buy it now. I like how the IAPs do not get in the way of playing the game..hopefully that is true for Frontiers.
It looks like they still made it playable without IAP. I don't really care for how much the heroes cost, but I'd imagine you don't need those to complete the game either. I figure I'll use the free heroes until I've beaten the game and then go back and pay for the others and play around.
Honestly, this is a really small, incredibly hardworking dev team. I actually don't mind throwing them some extra money towards Heroes/gems. They deserve it.
I got stuck on the last mission in the original version Dark Fortress or some such and never spent any money to beat it and just gave up.
Now I was stuck on Lost Jungle in the new version and that is only about 8 battles in so I bought some gems and beat it so I could now continue. I did not buy a new hero though so far. I have Conan fully loaded and he pretty much rocks compared to the others available for free.