Haha, really nice game! I like the concept, the art looks nice and the soundtracks are creating the right atmosphere.
I guess now the best tactic to win is to steal every fish from the red guy, haha.
Would be interesting to see a 2P version. Just would be necessary to add some mechanic for those fights over the fishes since now it is only who is closer is pulling harder. Maybe some collisions between players would do the trick. Or some other mechanic which will get the other player out of the way for a while.
Keep it up. Have fun.