Numen: Contest of Heroes basically plays like a single player MMO, complete with hotkey bar, ability cooldowns, and combat that doesn't feel like it's quite connecting. It isn't a great game, but it's at least a decent one, and well worth the huge sale prices I've seen it (currently $0.99 as I write this review.) I myself picked it up for $7.50 soon after release, and don't really regret it, though $5 or less is the sweet spot here IMO.
The introductory / tutorial section is pretty boring, but persevere and the game becomes more enjoyable later. You start out as a kid, and through a few quests learn the basics of the three primary classes - Warrior, Archer and Mage. At the end of the tutorial you get to pick which of the three classes you want to become, and appear as a leveled up adult with only the abilities of the chosen class. At the same time you also pick which God to worship, granting you additional abilities and bonuses, which increase as you make your God more proud of you through your actions.
Then it's standard fantasy RPG fare. You go on quests, trigger events which advance the plotline, unlock new areas and make more quests available, kill monsters to level up and get better loot, and eventually kill the final boss and beat the game. You encounter other heroes along the way and choose whether to help, hinder or ignore them. And there's an Arena tournament event where you can fight these heroes as well.
The balance seems a bit off in some areas. A couple times you can be thrown into a new area severely underlevelled for the enemies, and have to grind before you can take on more than one of them at a time. Then 3/4 of the way through you find that 90% of your attacks are critical hits and enemies don't stand a chance as long as you don't get careless.
Overall I'd recommend the game when it's on sale, though not at the base $9.99 price.