Is there a stated estimate of what the G forces an astronaut would experience on Starship 1 when leaving Earth orbit?
In vacuum maneuvers will be taking place with the three vacuum Raptors, target hoped for thrust somewhere around 2500 kN each. For a loaded Starship at around 1000 tonnes F/m=a gives 7.5 m/s2 or just under one G. As the tanks empty this would increase to around 82 m/s2 or just over 6G.
If you use the current actual Raptor thrust around 2000 kN this gets a peak acceleration of 50 m/s2 or 5G.
This puts the forces around those on an Apollo crew, but higher than the 3G peak targeted for the space shuttle, though the same throttle bucket approach may be used.
Actual G forces departing earth depend a lot on final engine thrust, final Starship mass and mission profile (how empty the tanks get during departure).
While less efficient it would be possible to operate all six engines which would close to double the forces, though there are few cases where this would make sense.