After some feedback from the players, I've fixed a few minor bugs and balanced some of the weapons.

Changes:

• Can't fire the beam laser weapon continuously anymore by rapidly pressing the primary attack button.
• Slightly decreased the overheat rate of the beam laser, and increased its damage.
• Upgrading a weapon automatically installs it on the ship.
• Attack drones cover a bigger area and move faster around the ship.
• Fixed a bug which caused units to have negative scores.