This is impressive, but its still only 10km, not space flight. As I recall, the rocket equations used in the Apollo days (when most of the physics of space flight were solved) showed that single stage to orbit was not nearly as efficient as multi stage, dumping the useless mass as you go. I would really like to see the math that supports that this single stage to orbit concept will allow for a reasonable payload AND propellant for a soft return to the pad.
This is only for testing landing ability and the FAA will only allow 10km flight, a test booster has already been made and stacked it will have 20 odd raptor engines to boost starship into orbit. Still and all wonderful to watch the development of a new launch vehicle in public view. I just wish I was young enough to good on a trip to mars.