Plenty of fun for the price (I think it was $5 or $6 when I bought it; can't remember). The graphics are surprisingly good (I'm playing Gothic right now and Arx is hands down better and more smooth) and the game is quite interesting and difficult.
Positives:
- refreshingly different magic system
- lots of easter eggs and interesting bits
- great atmosphere, music, and surprisingly good graphics
Negatives:
- sometimes the puzzle aspect got a little wearisome; be prepared for lots of trial and error (and death...man I sure died a lot in this game)
- can't queue up enough magic spells, and casting on the fly is quite difficult
- voice acting is pretty darn lame
There's no character development at all, and the plot is quite linear, but as a dungeoncrawler it is a lot of fun.