This is a neat demo!
In it's current iteration, it feels pretty basic, but relaxing and enjoyable. I found myself playing it for a fair bit longer than it took to find an optimal sorting strategy, which feels like a good sign.
It felt really easy to 'win,' but I notice the "cuddly slime critters pending" line. Throw in some mischief along with the snuggles, and I can see this turning into a really adorable, really engaging physics puzzle game.
I'll definitely be keeping an eye on this one!