Hey Justin!
I used to help take care of the turtles in my Environmental Science class and I have to say this one has a much nicer vibe. Way less bite-y. And cleaner. I enjoyed playing this little pet game very much. I think the limited UI made me feel more like looking at an actual tank than a lot of the interfaces mainstream pet games. I also think your turtle AI is really successful here. To me it feels like a little animal and moves pretty natural and while it is pretty simple I think it really adds to the immersion and relaxing nature of your game. I agree with some of what others said that customizing the tank could be cool. I also think a little logic to polish the food spawning so it doesn't displace itself by spawning two pieces on top of one another when you click in the same place twice would actually go along way to improve the game feel and help me better focus on the relaxing vibe. I enjoyed my time with this game, thanks for sharing it!