Items added:

- Energy bar showing player energy

- Levels: a level ends when all of the enemy ships are destroyed. When the new level starts, new enemies (and asteroids) spawn.

- Lives: the player is no longer invincible, and has a limited number of lives (3 for now).

- Action screen display: informs player of important state changes (eg: "Level 1", "Level Complete", "Ship Destroyed", "Game Over"

The project is now an actual game, with a start and finish.

The graphics are all still extremely basic for now; essentially they are placeholders until I finish working on gameplay basics and start concentrating on the "look" of the game. This won't be for a while yet as there are still many basic elements in need of attention, such as enemy AI, screen information, level loading parameters etc.