I am re-reading Warbreaker and I just can't get over how amazingly well this world would work for a video game!
The vibrancy, or lack, of color could look amazing and be used to create a very neat world.
The Breath based magic system is already inherently level based with the heightenings.
I picture a world that becomes more diverse and colorful as one gains more Breaths. This could aid in locating hidden doors or detecting items/traps etc.. Also as one gains more Breaths things like lifesense and increased health come into play. To counter it you have Lifeless and Drabs that can not be detected so your enemies can be balanced naturally to your current status.
Couple this with Awakening abilities as you learn more commands and gain more Breaths and this could be an awesome game. It would be awesome if all objects in game could be awakened and a limited number of Commands made available. You give up Breaths in order to animate objects which translates into trading internal abilities for an external benefit. If you can get the Breaths back great if not you are stuck at your new Breath level till you can get more. Buy breaths, convince others to give you breaths etc.. and you level up.
This world to me was MADE to be a video game. You have to conform other books, even Mistborn, into a video game scenarios with leveling and balancing but they always seem artifically restricted in order to create a working /sequential gameplay. Nalthis and Awakening....it is organic.