not a bad idea for a flash game, and i missed the typo because i'm dyslexic but too few numbers gives it -1 points and lack of restart button gives it -2 points.
Very good game, original idea i loved the different explosions and firing/health correlation. i found it pretty easy considering i had a baby on my lap, but that could be tweaked in a second game. 5/5
ok for a basic game, though i tend to like games where the enemies and or yourself upgrade through the levels. can't judge the sound fx cause i had them muted.
the havoc is an auto-fire mini turret. Like a point defense system. it will take out missles and if you are lucky a small fighter or 2. if it's upgraded it does better.