But, as for more features... I definitely think there should be levels or breaks, where you can buy upgraded weapons and maybe ships. Also I think there should be some type of enemy that you fight (appears at random times). You get money for destroying asteriods and enemies to buy stuff). That would make the game MUCH better.
haha, yea, I noticed that... Your game is similar to mine, but you used nice effects. As in mine the grenades explode if they come in contact with the other player... I dont like waiting