Those poor pigs... A simple game, that's rather satisfying. Got sounds, music, simple but effective art and a solid game-feel, with the AI of the pigs it adds a unique flavor to the whole thing, avoiding it from just becoming another basic space-shooter. Well done!
My only complaint would be that I would have liked to be able to hold down the mouse to continuously shoot, rather then clicking. Also while the AI is very fun, it seems like the lack of space for them to move makes them gather on the sides/walls, making it very easy to shoot them after a while. To be honest, I think the game is played in the wrong shape and just does not make the best use of the AI. I think an better solution would be to have a "round" level, with the player at the center, just rotating + shooting from there with pigs spawning in from 360 around the screen instead would have been better, removing the "walls" issue completely and making the pigs always able to move.
Cool game! Really enjoyed the focus on the AI.
Also, side note: could not get this to work in FireFox, had to use another browser.