Not terrible
You could make this a good game by having
obstructions fly across the screen randomly as you try and shoot.
also give a scoring mechanism, say.. +100 for the green item
-50 for red, -10 for hitting an obstruction. Also a time limit
to complete as many levels of increasing difficulty as possible.
you could then add trophies for say.. a score above ____ or
a no0b trophy for largest negative score when the times up.
Right now, as it.. the game doesn't work after level 1. Just a hint.