PaperBack exists. It's branded as a joke, but it is functional!

You're slightly off here. Elon (and Tesla as an extension) doesn't like LiDAR, and doesn't use it in any of the vehicles. Cost, complexity, and sensor fusion issues make it undesirable to them.

Tesla is using a vision only approach for their various driver assistance features, including FSD (and you should be able to find presentations where he mentions that humans use vision, so the cars should too). Whether that is a good thing or not is up to interpretation.

None of the past or current Tesla models have LiDAR sensors - only radar, ultrasonic, and 7/8 cameras (with radar and ultrasonic sensors being absent from some newer vehicles)

They have an Instagram account (but I can't remember how to get to it, since I don't have Instagram), but they have more designs on their square site

If by "first game" you mean HL1, you could try playing "Black Mesa" which is a fan remake of the game, in the same engine that powers HL2. It's not a 1:1 recreation, but it's close enough (and I feel it improves on some things).

HL2 is also 3 seperate games (HL2, HL2 Episode 1, HL2 Episode 2), so make sure you have all of those in your library.

At the very least, I'd suggest playing HL2/EP1/EP2 before Alyx, since those would provide the expected background for Alyx, despite it technically being a prequel-ish thing.