itch.io

it's meant to be a satirical parody almost of innovation? throughout the game the village gets bigger and more industrialized, and the ending shows the overfishing that happens and what it leads to, a lack of tuna. Might be reading into it but I really enjoyed the ending, shows the dangers of overconsumption and industrialization (if you like this topic I recommend looking into 1800s America and Britain!!)

basically the ending was that the cat you play as (i forgot his/her name) overfished (aka fished too much fish) and then there is no more tuna/fish (aka no more food) and then cats started going poof (aka they died) hence the cat you play as looks sad at the finish screen

hope this helps!

(correct me if im wrong)