To unlock new attacks, you need to find these big, coloured, glowy balls throughout the various missions. Sorry for the blurry image, I was running. Which missions can I find each new attack in? ...
If you shoot the petrified trees around the area, they'll burst forth with new life and the leaves will turn a vibrant green. But aside from the mission(s) where your goal is to heal trees, does ...
The tutorial for Caster specifically mentions editing a certain game file (settings.ini) in order to access video settings that aren't available from the in-game menu, like shadows, anti aliasing, etc....