I enjoyed this game loads! It's really my kind of thing. Having a 10 min timer with an online leaderboard gives it so much replayability and I love the gameplay loop you should be super proud!
It did take a while to understand, if the tutorial was split up and each section shown when you got to that point it would help a lot. As I forgot how to activate the planets once I finished reading the full instructions and got stuck for a while. Also, you can soft lock yourself with auto-buys so a toggle would be good.
Additionally, after playing for a while and having the top score I got some insight on some balance. I imagine it's the only thing you really understand after many attempts of playing, yarn cost for planets further out should be more expensive, even if you have a close planet to connect to. Having them always be 2-3 yarn makes it trivial to buy every planet at once just a couple mins into a run. And by far the best strategy is to get like 25 yarn at the start, then buy every planet at once then play the entire game on the way stronger end planets.
But other than that small polishing stuff it was great so very well done!