Very nice shots! There seems to be a lot of ambiance in this game. Hope you'll manage to code a good gameplay. Also I'm happy to see my trees in action

Maybe the crystals could have a little more transparency and fake-reflection (in the skin...cause you don't want shaders). You could also add a lens flare effect on the edges of some crystals...(I mean a car-lights like lens-flare effect...)

Nice project...good luck!