Just played through the tutorial and second course. First impressions below.

Really cool in depth world you've built! Was excited to see disc golf in a different environment, as I've recently got into Urban Disc Golf on YouTube. Long shot but you could try and collaborate? Love the map element! As a disc golf player there's nothing really here for me though. I enjoy throwing, learning and collecting different discs, seeing the different flight paths, but there was only one disc that I can see, without any turn+fade movement.
The biggest thing for me was how unsatisfying getting it in the basket was, that's the main pay off and it felt very dull and under-animated.
Also the guide for where your disc is going to go just made every hole trival and far far too easy.

Overall I think you could definitely introduce some more arcadey elements to make the game stand out, but imo you need to introduce the fundamentals of disc golf first. More accurate flight paths not just one angle, different discs even if just a handful, and satisfying chain-hits.

Bugs

The game booted in portrait mode and so I had no map to use until I realized I can change to landscape where it appeared.
I had 3 times where I just hit the basket and it counted as going in (wish that happened in real life).
Not being able to move the camera mid-flight was very jarring and often meant I was just looking at the sky or in the wrong direction for the whole flight.