Addictive but needs work.
I give you credit with the good idea and you did pretty well for your first game, but there are some problems that need fixing and some suggestions.
I think you should make a bigger environment to play in so there's more chances to avoid the enemies. Either that, or implement some sort of system were you can buy guns or shields to protect the ship/attack enemies.
Also, I don't know if this is a bug or not, but several times when I chose to replay the game my ship would die 5 seconds after I respawned. It would also die at random times when I was nowhere near an enemy.
It's not bad, but it needs a lot of work. Keep trying though!