Hi, thanks for playing!
All I did was the design, animation, and code. Most of the 3D art was from kenney.nl. The HDRI/panorama texture was from freestylized.com. The road assets were provided tile-based, which allowed me to use Godot's GridMap node for the majority of the level design. The asset pack already came with a curved slope tile, so all I needed to do was give it an automated Trimesh collision shape and align the Path3D that the cars follow along that slope, which wasn't difficult with its built-in bezier curves.
I went for a goofy theme, because as much as I enjoy a nice and dark setting, I've noticed that often people are more likely to overlook unpolished elements if the game gives them a good laugh.
Its very messy, but I decided to release the source code on GitHub: https://github.com/CrankyCranton/freehand-driving