Hey! I LOVE builders like this. The art is cute,  the music  adds to the game without being too repetitive or noisy, the tutorial is pretty good, and the descriptions make a lot of sense. I didn't understand how the Vivarium works. I was also playing the browser version, which would just freeze after less than 5 minutes of gameplay, but what I did see was really nice. How does the Vivarium work? I wish I could have played longer into it. But great work setting it up! This looks really solid. :)