Easy to learn hard to master
While you can buy units, skins, visuals, etc. for your army with real money, all of the essentials and a limited number of fluff items can be bought with in-game money (earned from winning battles). A player can complete this game without ever spending real world money with time and effort!
For a turn based game, it is surprisingly good with a fast enough pace. Keep in mind that it is an early release, so noticeable bugs are present but will be fixed as time goes by.