I found this a very fun and unexpectedly emotional game.
The mechanics you have laid out here are concise and well executed which makes the experience a lot of fun to play. The sound and music really compliment the story you're telling here too; I found myself getting weirdly attached to my dead fish which is something I didn't expect to happen going in, but was a really welcome experience!
During that final cutscene I felt a weird mix of happy and sad, so I'm really impressed you managed to capture a feeling like this in such a short amount of time. Really great work!