This is so cute!! I love the names of the planets and found myself wanting to unlock them just to see what they're called :')
The music is lovely and the music pop ups are a nice touch. And the option to skip song in the menu as well is great!
I think a preview of what the planet does would be nice? Since you can yarn to anywhere it would be nice to preview in case you want to spend some extra yarn to get something specific in repeat playthroughs.
I'd also like if you could toggle auto buy - I bought one and realised it bit me in the butt when it was draining my resources, lol.
One phrasing issue was the item that says "Halves the production speed of a planet" which makes it sound like it slows it down, I guessed you meant "halves the production time"
Great game well done!!