Improve the graphics
The player ship wasn't bad and if all the enemies were of a similar quality it would be an improvement. Perhaps have a health bar instead of those numbers underneath. More room on the screen would be good that way you could keep the insane amount of fire coming at you while still having a chance of surviving. I'd also have a few seconds before the enemies appeared, the first time I played I died straight away. Keep working on the idea tho, I think you can make it a lot better.