That is some well thought out feedback, thanks for taking the time to write it all out.
We’ve definitely considered some of the items you mentioned, and will talk about some of the ideas that are new. All this play testing has been helpful feedback for us to make the experience more enjoyable for any one who picks up the game. We intend to make changes after the game so we can slowly work everyone up to the higher difficulties while making it feel like the game is playing fair.
With the time we had and the amount of play testing done, we were happy with what we put out and hope you can take advantage of the skip button to experience more of what the game has to offer. Again, things like shrinking the planets (like in the last level) and a projection of an orbit are things we intend to tweak and hope you come back to try those changes out after the jam :)