Nice job, I didn't play till the end cause it was gonna be long but it has a nice design.
Few notes:
- The star tile you made only fits a 3rd of the screen horizontally and I can see it start over and over as I move, you should make a bigger tile or just generate randomly (not sure how you'd do it in unity) otherwise freaks like me will get all up in your business about it
- really liked the gravity pull on the planets, this is a nice space sim, you can add a lot more here