This is exactly the kind of game that can pull Squab in and have her playing for hours. Low stress, creative freedom, cozy and relaxing. It has a deceptive amount of potential for creation. You think it's just decorating cakes, and it absolutely can be. But you can make sooooooo much more than cakes that look like cakes.
We would like to see more music options but the music that's in there now is at least the right amount of unconscious background that it never really gets old. It just doesn't quite fit.
The interface kind of relies on the player figuring out how to use it, which can lead to not knowing how to do things or that things can even be done unless they're stumbled on accidentally. So, adding in some visual cues or instructions could go a long way.
Once you know how to use the controls, though, there's so much to do and we really liked the feel. Everything moved and was manipulated really smoothly, which is especially important for a game entirely built on placing things where the player wants them.
Also, the ability to bulk edit items that have already been placed would be nice. You said that's already planned, so that's good.
The finished product looked really nice and luckily the autosave works really well. We had a lot of fun with this and see so much potential as you keep adding to it. Keep it up!