The concept of Demigod is quite simple: A god has fallen and several heroes have stepped up to battle for the right to take his place.
The gods, accepting this challenge, have created a number of godly arenas where these heroes can call upon their former allies from the mortal world to help them achieve victory.
In a large sense, Demigod is a strategy game. But it's not like Supreme Commander or Company of Heroes. Instead, it is something quite different as it is very tactical in nature.
As someone who likes big strategy games, I wasn't sure what to make of the first Demigod alpha I played. But Demigod quickly got me hooked. As a Total Annihilation and Supreme Commander player, I really like the idea of a "commander" (your hero) leveling up and leveling up.
The gods look on as the battle ensues and wages are made on every fight big or small in the arena with the player collecting his portion when things go his way. This money can be used to improve your forces, buy spells, buy artifacts and items, recruit units, construct special buildings, etc.
I have played as both a "general" and as an assassin. The general plays mores similarly to an RTS where I am recruiting a lot of my units who fight on my behalf and I have some control over them. The assassin is much more about the hero being a bad ass. You put your money and efforts into making him increasingly tough and sending him into the mix to do some real carnage. I don't know which I like better, each build of the game gets dramatically better than last so it's hard to say. I will say I've been surprised at how much I've been enjoying the Assassin given how tactical it is compared to the general.