Great layout and tower/restock increases difficulty and focuses on areas.
Lots of great puzzles, and the four towers idea.
Lots of combat, or course :)
Nice puzzles, great originality.
The whole keep/tower layout just feels logical and right, giving it a fantastic feel.
Definitely one to play.
The start in the prison/keep.
Needing to drop down a pit to solve a puzzle... a blip on an otherwise great set of puzzles and levels.