I like that it was immediately obvious which houses correspond to which animal. Every now and then, I did encounter a slight issue where clicking an animal wouldn't work (this issue does go away after a couple of seconds).
I like the endless style of the game, as it could easily end up being be an arcade style game where points are given for correct sorting and points are removed for incorrect sorting. At the moment, there doesn't appear to be an end. Though it is somewhat relaxing just sorting the animals without fear of penalties or time limits.
A peaceful animal sorting game.