Thank you for the game!
I have to be honest, I found it very hard and it gave me a bit of vertigo. And although it's clearly not my cup of tea, I think that these are actually the signs of its beauty.
With that said, however, I think that game would benefit from more clear color and shape coding, as fishes and garbage pieces are sometimes very hard to tell apart from one another, especially at higher speed. Also, something with the scale of the game makes me uneasy too: maybe if the scale would have been 15-30% smaller, and the river a bit narrower, focusing on obstacles would have been easier, because they would better fit into the player's field of view.
Nevertheless, I think this game is neat!