Thanks! Driving feel comes from physics modelled wheels and tyres with torque and friction values. If I had more time I would have modelled the engine and drivetrain too. I hope to reuse some of the learning in an online driving sim I am building.
Bubbles came fairly late and likely need to be tuned a lot more but they do all affect the physics model of the car.
Recording feature is in-game video recording. I built the game in the browser mostly on a Chromebook as an experiment into what the web can do these days and gameplay recording felt like a gap in the technology so I built a solution into the game. There's more detail in the dev log I wrote about it.
Thanks for the great comments and questions!