So this is a game where a Mage has terriforming powers (sorry if wrong spelled). I think you should some other stuff with that:
Block Making Powers:- Blocks which will fall but some physics (water, lava) will make them float/sink.
- Blocks with powers (slightly higher jump etc.)
- Mirror blocks (will affect light).
Different Power Ideas :- Wind! It could power stuff that have to have a sail (or whatever the thing is) or just to be powered by wind!
- Ice! It could freeze wateror cool down individual pieces of lava (or something like that).
- Sunlight/Moonlight (yeah I know It doesn't make sense but it doesn't have to be realistic!). It will trigger some stuff (like in ancient ruins and traps!).
- Water/Lava physics. Make it fly up, Make it split or other crap.
(Candy to anyone who will find out from what game I am ripping off these Ideas
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