Great game, congrats! 5/5!
I would love to see two things:
It would be good to have a heading indicator in degrees,and more important, some improvement on destroyers' pathing so that they dont end up off the water, it is really annoying to have to restart a good progress in survival.
it would be a pity if the makers dont work on the game a little bit more..the idea is a bright combination of sniper and zombie shooter games, and i havent seen anything similar to this up to now..keep up!