Ophiuchus 0.3.2.1

Ophiuchus is a multiplayer strategy game in a similar vein as the Master of Orion series.
Ophiuchus will go through many phases where it is a completely playable game and it comes with further features added on with each major release.
The reason for this is that it is quite impossible for me to create a fully-featured game in one go. Doing it in steps allows me to re-check the game for gameplay quite often. (This also means I get to play it a lot, which serves to keep me interested.)
I aim to eventually create a game of rather large proportions, but this may well take some time. As such, I am concentrating on the gameplay of the game first, on the assumption that while graphics improve and change, gameplay stays eternal.
The game map is a rectangular board of tiles. A tile may contain a star. Each star is orbited by a single inhabitable planet. Each player starts out inhabiting a single planet, and owning 10 units of money.
Each planet a player owns adds 1 unit of money to their treasury per turn. You may build spaceships at your colonies, which cost 4 units of money, and take 1 turn to construct. Spaceships move across the map at a rate of 1 square per turn.
If a fleet encounters an uninhabited planet, it will automatically colonise the planet. If you encounter a planet owned by another player, you can attack and invade it. Combat works on the simple principle of winner-takes-all.
Whichever side has the larger fleet destroys the other side. If you retreat from combat, that is, if you order your fleet to leave a system while another player orders their fleet to attack yours, you lose a third of your ships.
You win the game by invading all colonies held by all other players.
Enhancements:
- When multiple players arrive at the same uncolonized system at the same time, none of them can colonize the planet now.
- Previously, the player with the lowest ID got the planet, leading to an advantage to players with lower IDs.
- This was a problem especially in single player mode, when it gave a great advantage to the player over the computer.
- Attack commands now always give feedback.