The shadow of the player's spaceship is black and very very close to the ship's shape.
This conveys the conflicting visual information that the ship is actually very close to the ground.
What could be done?
Drawing an accurate shadow would require the game engine to:
1 actually know the depth at each location on the ground.
2 figure out where to place the shadow
3 including when the shadow is cut in pieces by discontinuity (see for example shadow of one of the lamps on
https://www.gridsecondlife.it/wp-content/uploads/2019/09/PL_EM_070906-05.jpg )
This is imho irrealistic to expect from the CPC.
A solution would be to remove the shadow altogether (I remember it was not there at the beginning), pretending that "the ship is so high, its shadow is outside of the screen dude!". Which actually make kind of sense.
I remember the shadow was added for better contrast of the ship against the ground.
To preserve contrasts, maybe surround the ship with a black outline all around ?