This is a neat little puzzle game. The basics are pretty easy to pick up by playing, and it is nice to have the notebook to get more details for the things that are not immediately clear.
The game started out at a good progression, teaching the basics well. The difficulty ramped up at a good pace for most of The Hatchery, though some of the middle felt a bit easy.
The Commons had a neat concept, but once you learned how the happiness worked by color, the rest of the levels felt repetitive and just added more steps to complete the same thing you already did. That area needs to have something else added to make later levels feel more challenging and make you think.
It took me a couple tries to realize that the hatchlings grow up in The Nursery's final level. I tried to just do all the combos to start and then fill in the Cradle. I felt that all the other levels of the Nursery were fairly easy and obvious.
In The Reef I like how the one that would be eaten shakes when the threat is nearby. Only one level gave me pause when I thought I had to do it in 1 step before realizing it could be done in 2 and the other spots could be filled with a blob that does not change.
I was able to get 3 stars in all the levels. There were a few that I had to try several times to figure out, often due to an oversight on my part, but overall they were pretty straightforward once you learned the rules. I think The Commons needs work, but the others are a good starting point. There were several points in the other levels that things felt like they might be too repetitive and obvious, so be mindful of that as you design later levels. They will need to progressively get more challenging and keep players thinking to solve them.