Simple and basic consept, I really like your idea. If Im right, thats a mobile game.

I have some suggestion: Make evrything a bit larger, firtly i think that the enemy ships are bullets, and I miss some feedback about I hit sth with the bullets (like particle effects)

But all in all, I like your game, nice job! :D

For those that don't open the game page: This is a high score chaser, and arrow keys are your movement controls. Also, my high score is 242!