It is cool! That's a five minute ride - just you and the mountain - don't even have to wear a stupid helmet!
I'll spare the site more of these. But after seeing the video you posted, I looked for more, and found some. Yours is the best. The boy is brave.
The cars have brakes. In another video, a little girl rides behind an adult, in a two person car. Going down, they use the brakes, because she is pretty scared, if her screaming is an indicator.
The adult in the car behind them, filming, says keep going. You are ruining the fun by braking.
I would love to take that ride.