Thank you for the feedback!
All of your critiques are definitely things that could be improved, and I definitely would have if I had more time and playtesting. The difficulty in spotting asteroids probably could have been resolved by making them bigger and maybe even a different color. The dragging physics probably also could've been made nicer with a more custom solution rather than relying on built-in drag to enforce a speed limit. The AI does take into account multiple asteroids, but I probably should have spent more time tweaking how it weights them all and decides what to do.
The particles and sounds were the last things I added. I finished most of the mechanics, and I was like 'this needs just a touch more' so I added some particles and sounds because they're pretty quick and easy for the amount of impact that they deliver.