Update with few changes

Towers now show a  short muzzle flare when they shoot,
There are also paths to the Towers but I still have to figure out a way to select them.

The game stops if either Nexus has it's Health counter drop to 0 (always the one of the Right because it's not randomized)

Pressing Escape returns to the Menu.

PS: Switched the fonts used: Bradley Gratis for the Menu and Vegur Bold for the in-game UI.