As I played, I made a bit of a list (sorry if its a lot). I wasn't able to get through all of it yet, but here's what I've gathered so far. Even though it's rough around the edges, there is a lot of charm to this game and I can't wait to see the development progress, as it has been :)
1. Main menu navigation with a controller is a bit finicky, specifically while changing options. When I selected an option and pressed A to change it, it seems to turn it on and off very quickly. I needed to adjust my options with my keyboard and mouse in order to make the changes more reliably.
2. After selecting gamepad as my input device after starting the game, prompts still appear as keyboard prompts for the first cutscene. After loading into the second part of the cutscene (after you see 2 vans on the moutain pass), it seems to switch the prompts to gamepad prompts.
3. The initial feel of driving the van is really jarring, I think the lack of rumbling while driving or losing traction is throwing me off. Maybe a slight rumble to let you know you're driving and something a bit more for when you're drifting would help me feel more connected with the vehicle.
4. When at the "Home" location, the same buttons to navigate the menu also manipulate the camera angle. When I press D-Pad (specifically Up/Down) to navigate the menu, the camera zooms in and out.
5. I was able to put my van on stands (while changing out wheels), but never selected any wheel. Now during the cutscene of the "Meet" location (first time seeing the 86), my van is on stands
6. The meet started while I was on stands
I stopped playing after encounter that bug, but I plan on playing through this entire demo.
If you need anymore specific details, feel free to DM and I will do my best to explain how I got into certain states I described above
Edit: I recorded this video to try to visualize the issues I've been having with controller.