Rules of engagement
#1To keep more players active and not quit there should be a rule for who can attack who at any level. A player with 6,000,000 points should not be able to attack a player with 100,000 points. If you want the game to grow then don't keep destroying the little guys. Say 5x plus or minus is close for all players. It is very frustrating to start to build a fleet and have fun to get a high level come wipe out your entire fleet.