I got the main gameplay working!  It’s not got any win condition or anything like that, but, uh, you can drive a spaceship around under the ground and punch your way out of the crust.  Also the spaceship has some pretty nice thruster effects if I do say so myself.

No idea when the actual deadline is, I’m doing to set myself a deadline of 4am my time, 8 hours from now.  Then, whatever is Done is Done!  Next, adding the win condition.