-------------------------------
*Start off with your ship basic firing abilities.
*Each enemy destroyed gives credits for buying better weapons.
*4 levels and 4 bosses.
*Earlier bosses will be doable without anything but skill but later bosses will literally be impossible without the correct combination of bought power-ups.
*Each time you clock the game it gets progressively harder.
*Random *super* enemies will appear. Normal enemies that are a special colour and much tougher/faster than others of the same ilk however they will give a fat credit bonus when destroyed.
*Some variety in enemies during later replays.
Est.finishing time, 2 months from this post.