Interesting idea. I liked the strategy of having to horde the food for yourself, so doing things like hiding near a big bunch of food and then eating it before the other fish could made me feel clever. I think it would be a little more fun if I had a way to attack other fish, because especially when it got down to and one other fish, it took a while to win as I just had to kind of bump into them and try to snag the apple they were going after before they could eat it. Some sound effects and a little more feedback would also be very good. I also had a little trouble understanding the boos mechanic, It seemed to make me go faster but only side to side and not forward. And there also didn't seem to be a limit on how fast you could go side to side.
Overall, it's an interesting idea that has some fun strategy elements, and I definitely think it has the potential to be expanded into a full game.