It's a bit difficult cos when i think of flight I usually think planes rather than people, but if you look at Weckar's entry for the last magical girl game jam, I feel like they had some good ideas. In general noclip flight feels like 'normal wasd but no gravity', whereas I think yeah, flight-feeling flight has like, a sense of inertia or drift, accel/deceleration, trailing animation stuff - a real sense of physics to it.