The game is available on Windows, Mac OSX & Linux.
You can grab it on Steam with 10% off till Friday noon (GMT+1) :
And if you really dislike Steam and/or really like me (ie: ManuTOO ;-) ), you can buy it at the regular price from Mana Games (and you'll also get a Steam Key as a free bonus) :
|Paypal: secure payment fastest solution to get the game, only available if you're outside of EU||
|Fastspring: secure payment||
More info about the game : http://www.managames.com/DungeonGuardians/about/ .
Have a nice week,