the fire rate is too slow for thing to take 2 hits to kill, it doesn't need to be stupid fast but it's annoying as it is. enemy shots eat your shots which is painful. power ups don't spawn often enough, you miss the first set and you lose the game on timer. the platforms are too cramped and eat your shots, fix this by making the jump better maybe so you need less of them.
functional but needs a lot of work.