Cool graphics man. Fish mechanics are very interesting and the text explains almost everything you need to know. Though the fish themselves seem like they could be replaced with most animals without many changes, the game itself is really good and enjoyable.
Same as pello, I suck at this, but I recognise the work you made is really nice and sometimes even challenging for the player, as you have to double-check everything you've learned in order to complete certain levels. Keep on the good work!