Hi, your game was recommended to me by Jannik (see below) and I really like it! I was thinking about a very similar concept in the past and even made a prototype, but I found a game that was doing it better than my prototype, I recommend you have a look at "Astro Golf" for inspiration, it is very well done. Are you still working on this one?
(Now I want to work on my prototype again, lol)
I'm so glad you like it! "Astro Golf" and the space levels of "What The Golf" were the major inspirations - this project was developed as a way to get used to Unity's physics systems. I take a look at it from time to time, but not enough to keep regularly updating it haha - if you have any improvements, I'm planning on giving it a bit of an overhaul this summer :)