I've only a scarce amount of time in the game so far, but a simple change I might recommend - the intro and the tutorial at the begining are a bit long for some players who prefer to get in the action and might lead to some people missing out on/skipping crucial information. To avoid this, and aid players who are picking the game back up after a break; I propose the following solution: add a little question mark in the corner of each page - all the button needs to do is open an over-lay that gives a brief discription of what each button/option does.