For those who don't know, a cute co-op otter game was released last year. I haven't played it, but it looks very sweet. It is called 'That One Otter Game', and it is free to play. Worth noting, I think it is local co-op only.

Here is the page on the Steam store: https://store.steampowered.com/app/3823460/That_One_Otter_Game/

And on the Itch.io store:
https://artfx-school.itch.io/that-one-otter-game