Thanks, I'm glad you had fun! It's sort of a sandbox, so there's multiple different ways you can stop the asteroid. I probably should've added some tips, but it's basically all trial and error.
Thanks for the feedback! I probably should've made it clearer, but you can see the asteroid's position by interacting with the telescope or checking the minimap (if it's within the radius of the minimap).
You might have to use multiple bombs/rockets to see a change. Check the telescope to see what's most effective. Also, the sooner you apply forces to the asteroid the better.
Thanks for the feedback, I can see what you mean about tighter controls. Also, I probably should have added a visual connecting the portals so it would be less confusing.