Something's Missing...
This game seems very... unfinished. I'm not sure if there was supposed to be a way to shoot down the enemy ships or not, but I couldn't figure it out for the life of me.
And if you just scroll all the way to the top of the screen, you can go forward forever and ever without being hit.
I would suggest making it so you can shoot down your enemy, maybe add a counter to show how many you've killed so you can try for a high score or something, and obviously put some boundries on your movment. Good concept though!
~Tovi~