Great game. I'm not sure how hard it would be to have a frame limiter, but I was running between 250 and 3000 fps depending on the area and my monitor only runs at 60! So lots more processing going on than necessary.
Did some more monitoring: my GTX 970 was running around 35%, except on animated cutscenes like the ending, in which it ran at 80%. So that would be the main culprit for wasted power.