thanks for your feedback! try booting it up a second time, there's a menu there where you can change the settings, I've deliberately removed the main menu on your first play so that it throws you right in.
OK, I just got around to starting the game again and turning shadow quality to low was just what I needed! Went from 10fps to feeling like 144+. Problem is, it still maxes out my graphics card. Can you please add an FPS limiter option? I don't want to stress my cooling system :P
