extended gameplay time - unlimited rounds or scoring (competition on having highest score) , boss fights , powerups , spaceship upgrades, Shop , and more colors .. these are all just suggestions yet gameplay overall is excellent!, keep up the good work.
For me it was hard to know when i could shoot or not, you should make the glow more obvious. I also found myself having to look back and forth between my player and the type of gun I was using, maybe you could have an icon or graphic somewhere around the player. The overall game is very fun, keep it up!
