This is pretty neat! I like the idea of a shooter made from bubbles that come from sails on a boat. X) And the arena idea is a really nice one. Also, I think you're the first game I've played that has settings for the music and sound, so thanks! :)
The music and sounds in the game is well-chosen. And the sound effect that plays when you take out a boat person is pretty funny. I also like how you can fire off a shot, run off, and still hear the sound when/if the guy's taken out offscreen. The gameplay can get pretty chaotic and fun, and I enjoyed my time with it. Love the use of rocks in this game (though enemies would sometimes ignore them and shoot desperately at me and hit rocks over and over)--it's a neat design choice.
I do have a few problems with Operation S.O.A.P., though. Like @Timothi Ellim, I would've liked a score counter to know how far I've gotten along the way. And the title screen doesn't really give enough of a clue to the game that you're about to experience. Also, the enemy spawning is overall fine, but sometimes they spawn too quickly--I had 6 boats chasing me at once at one point! And another time, an enemy spawned directly in front of me and fired off a shot before I could react.
Speaking of the shots, I couldn't shoot at all while moving, and that made this game really hard to play. Which is odd, because I think the enemies could (also, their fire rate was much higher than mine)? I don't know if this is because I'm playing on a laptop, and the game doesn't read my mousepad while I move (which is a problem I've had with FPS games), or if not being able to shoot while moving was an intentional design choice--please let me know.
I had a lot of fun with this one. Thanks for making it. :)