good but has bugs
It's a good game and I like how the fish changes with the upgrades. I ran into few bugs though that were quite annoying. One bug was that the people who fall off the boat are sometimes swimming in the air, aka flying so you can't eat them. I also once got stuck off screen after a big jump but that bug somehow fixed itself (my fish came back after stuttering for like 5 sec).
Also pretty big bug was that the level where you need to get 25 liters of blood, not enough humans come! I ate every human that came with boats and I managed to get 15-20 liters only (on several tries). After some time there are no more humans coming, like the last 30 seconds are that only the shark comes like 4 times in a row. You can't pass the level which was a bad ending for this game. Still it was worth playing up until that point. Good job.