First, a small admission. I'm a huge Trese Brothers fan. I've logged tons and tons of hours on this game, but it's all on my phone so I'll review the phone game here, and later when I get around to finishing my ongoing games on the phone and play on steam I'll try to update this.
Anyways, this is definitely one of the old school style of games. What exactly does that mean? Well, it's pretty unforgiving, and at the higher difficulties it's pretty much impossible not to die. If you do, no big deal though! You can always replay your last turn or restore to the last resting point you used.
What do you get for your $12? Well, as of May 16th, 2014 you get 7 characters (2 variants of rogue, mage, and cleric and a single varient of a fighter) as well as 2 "episodes" of content. What is coming down the pipeline? 1 extra variant of the fighter class as well as 2 more episodes of content.
What exactly does all that mean? Each character has a totally different skill set, strengths, and strategies. For example, the two rogues play wildly different; one specializes in her bow and ranged battle while the other specializes in melee destruction. The two clerics are even more different, with one being a traditional support cleric and the other being a much more combat oriented paladin styled cleric. Each episode is made up of 2 main chapters, which are both long and challenging. I'll talk about the first episode so you can get an idea what I'm talking about. The first chapter of episode one sees you protecting a town from a Ratkin infestation and is a good solid 3-5 hours long. The second chapter of episode one finds your party undertaking a risky journey to a second village and running through a nest of lizard-men. This one lasts another 3-5 hours long. That means you can roughly expect the full 4 episodes (when they come) to last for about 12-15 hours for a single play through, and you'll want to do more than a single play through!
Now, I'm sure people will knock the game for being a port of a mobile game, but that's really not a big deal. The brothers built the game with the idea of eventually bringing it to the PC, and there are keyboard hotkeys. Not only that, but the entire game can very easily be played with the mouse. The graphics are nothing special in the realm of PC games, but if you are looking for a really fun, deep tactical RPG then you really can't go wrong with this game. On top of everything I've already covered you need to know about the Trese Brother's work ethic. They have 5 games (currently) out for Android/iPhone, and are getting ready to release a 6th. They've updated those 5 games a total of 642 times, each time is either tweaking the game in some way, adding content, or both. They are amazingly receptive to their players, if you head over to their forums (or post in the community group here) they are more than happy to chat with you and will take anything you say into consideration. I've been a Trese Brother follower for 2+ years, and have seen them passionately work on their games the entire time.