The Galaxy is suffering under brutal reign of a mad tyrant, and all cower in fear of his doomsday weapon capable of vaporizing entire planets. But a brave rebel leader has arisen, to free the people or die trying.
To win the game, strike at the tyrant's capital - the more ships you have, the better your odds of succeeding. 6 ships are a guaranteed victory, but even with 5 or 4 you have a decent chance.
To get more ships, visit planets - their chance of giving you a new battleship are displayed as percentage. Planets with more than 50% chance are highlighted in blue. However, beware of occupied planets, highlighted in red - they are garrisoned by tyrant's warships, and will destroy one of your ships each time you arrive at one.
After you move, two things happen: the tyrant vaporizes the planet you just left, and dispatches his minions to occupy another random planet. This means you should move both quickly and deliberately, to avoid getting cornered or cut off.
There are special locations that can't be vaporized or occupied:

Purple Nebulas hide your presence, and after you move into one, no new occupier fleet will appear.
Golden Gateways are accessible from any point in the Galaxy, and can save you from a dead end.
Green Wormholes teleport you to a random non-occupied planet - a risky, yet quick way of travel.

Since Galaxy layouts, chances of help and final battle outcomes are randomized, not every battle can be won - but you can instantly start a new Galaxy by pressing ZO. Good luck in your epic cosmic struggle against tyranny!
This is an early version. Planned features:

SoundMusic
Jump animation for rebel fleet
More unique locations

Feedback is always welcome!