Welp, balance is pretty shite @ Alpha, but the gameplay itself is very interesting and unique. Basically, it's 10vs10, with each player controlling 3 units. Each team has a base around which your forces start.
Game is overall very fast-paced.
You earn both unit and general experience and silver by playing. You use unit xp to upgrade your units and progress along a tech tree, quite like games such as WoT and others. I guess you won't be playing against much higher tier players outside of alpha, but now you get to suffer, as higher tier units are straight up better. General xp can be used to either upgrade general abilities or be spent as free xp on unit upgrades as well. Silver is used to purchase generals, units and consumables.