A true vibe! I really like the music and sound you chose for this. I also got weirdly nostalgic, like even though I never had a turtle, I feel like I had done this or played something like this a lot when I was younger. I'm not generally a person who likes to play relaxing games, I tend to gravitate towards the most stressful entertainment possible. However, this little turtle kept me playing this for a good while, I just didn't want to leave the little guy. I really like the decorations you put it the tank, it really makes the space feel alive.
I think one of criticism would be that the turtle's back legs don't move, and I think if you added that to the animation it would go a long way. Also, it looks like the food disappears once it hits the turtle's shell instead of its mouth. Other than that, a nice relaxing little experience!