I really liked the atmosphere of this game! The way it looks and the fishies swim, very relaxing and serene. It feels like I myself am diving in the water! The intro is also well-made and cute!
The only minor complaints I have is that sometimes the fish swim through the stones and obstacles, making it a bit frustrating if you were close to the perfect shot of a cute fish and he just vanishes haha. And I did never really use the space/shift buttons to swim up/down, simply moving forward while pointing the camera up/down does the job better for me.
Other than that: A very calming, cute entry with good sound design (your bf did a good job with the music! :D ), had a lot of fun playing it, well done^^