The targets are a bit easier to hit on my 6 Plus, but I still miss them sometimes too. Moving the done button is a good idea, maybe up at the top instead of the bottom. Also if the Wave decks were moved to the side instead of below the troop cards the cards could be enlarged a little. I think it would improve the readability if the deck and discard piles were removed from the track in this digital version. They could easily be placed below the track, this would allow for the track to be magnified a little more so it's not quite so frustrating to figure out what's there. The track takes up a lot of space on a table and it makes sense that it is too big to be kept together for small screens, even an iPhone 6 Plus.