Its what it says on tin - Fantasy Kingdom Sim - or to translate its "Theme Park" genre :)
You do not control units directly, you create infrastructure and hire your crew from asorted fantasy cliche. And influence theirs behaviour with creating reward flags. So for example you click on Wolf cave and write 500 gold reward to anyone who will help to destry it [This can be done with one powerfull hero or multiple weaker ones will party up to task and share]
Every hero class have its personality, thief will go to suicide scout mission if price is right, wariors are likely to run into defense or clerics will much more likely participate in elimination of undeads and healing other heroes
Do not be fooled though.
Trough few tutorial missions seems easy and simple game becomes pretty hardcore later, still not its game where even multiple restarts do not frustrate me as its the way how to learn what and when to counter to survive in given scenario.
Graphics and GUI is nice and well thought out so you do not have hard time to find what you need.