Steam is now offering digital distribution of Trine, Frozenbyte's action/platformer with a fantasy theme. Update: This story initially described the price listed as $19.99, but it is now $29.99, as apparently the lower price was an error which was quickly corrected. Anyway, a playable Trine demo was released last week for your tryin' Trine pleasure, and here is a general overview of the game:

Trine is a fantasy action game where the player can create and use physics-based objects to beat hazardous puzzles and threatening enemies. Set in a world of great castles and strange machinery, three heroes are bound to a mysterious device called the Trine in a quest to save the kingdom from evil…

The gameplay is based on fully interactive physics - each character's different abilities help the player battle an army of undead and defeat hazardous contraptions. The player can at any time freely choose whoever is best suited for the upcoming challenge or puzzle: The Wizard is able to summon objects to help solve puzzles and create new ways to overcome obstacles, the Thief uses her agility and dead-on accuracy to swiftly surprise the monsters, and the Knight unleashes mayhem and physical destruction wherever he goes.