Really loving this game. After playing for a week, Im changing my review from 4 to 5 stars. The light theme masks a complexity that needs real strategic thinking. Understanding the strengths and weaknesses of each unit is the key. Each new map ramps up the complexity a bit but in a very balanced manner. From level 2 onwards, you will need to play them each several times to attain the Blue star but it never feels like a grind.
The only real negative Ive found is that the app is a significant battery drain, even when Im offline. Not sure why since it doesnt seem to be that graphics intensive. Im playing on an iPad Air2.
Please look into this, Devs. And, thanks for a very enjoyable game. Its so refreshing to play a game not riddled with ads or IAPs. Well worth the price of admission and, Ill be more than happy to pay for extra levels as they become available.