I found out how to kill the box ships. They die only by a nuclear explosion. Whats really weird about this unit is that a nuclear explosion will kill only one of those ships, making it incapable of killing groups of them. There can be numerous improvements you can give to this game. Those giant alien ships give the same amount of points like any regular ship. You should base the amount of points given on the difficulty it is to kill them. The upgrades comes very frequently, thus making it harder to get killed.
Cute game, especially the music. It could be better with some upgrades. The superhero needs a bit of a shrinking. Its very hard to dodge the bullets because it's roughly 1/4 the size of the screen and the enemies are half of their size.
I'll give you some credit since this is your first game. Like everyone said, the rings need a different amount of points. The bullseye should move to make the game a little difficult or else it will be a sitting duck. By the way, how the bullseye break and reforms causes a great deal of stress to my eyes. I wish you luck on your next game and hopefully you will do better.
I found a glitch in the game. I just happened to click Bush about the same time I got hit. The guy isn't throwing anymore and Bush is just talking, only without sound.
The only thing I learned from this tutorial was to copy and paste. Instead of just telling people to copy and paste codes, you should make the codes bigger so we can understand them.