Game Over Screen and Reset

Added a screen to show final points on game-over, plus “press R to restart.”

Added the game-over screen and reset command, as per the tutorial. I’ve been looking at videos describing the particle system, and it looks a bit lens-flarey, but I should learn it. Also looked into GitHub as an option. A better terminal in Windows would help…

Had fun ideas for levels and a background message system that provides level names, warnings, count-downs, etc. Possibly conversation as you play. That might be fun…