Excellent visuals, the colour quantization and palette works really well and it's all looking very polished and the actual core gameplay is enjoyable.
For points of possible improvements: It seems like maybe there's some randomization in the order you can get the courses - I think the second one I got was one that had a very steep climb with a barrier obstacle above it, I think that was a bit rough to start off so early with. As the game is first person, I didn't always know what I had to interact with straight away like if the door opened because I may have been looking down at the course when it happened. I also tried using the options menu but I couldn't leave it once I was on that page - tried escape, enter, backspace, clicking on apply, etc.
Edit: Forgot to mention that the main menu darkens the hovered option which was a bit confusing about which option was selected.