I tried the tutorial and got a crash, and I tried to quit the game normally and got a crash. Both times, the game immediately reloaded on its own. So, I tried Go to Mission, which does seem to work, only shooting in the mech causes my system to chug something fierce. I think I finished the objective, but there were so many audio clips playing I couldn't tell. I had to quit by using Alt+F4.
This looks like a very ambitious project, and I've made worse myself. Could use a bit more time in the oven.