There are several problems with this tutorial that were I not experienced in developing, lead to relative dead ends for new people. The engine component for the ship engines_player, does not render in the game or scene space until actually playing. In the Player Movement tutorial, the script fails several times throughout the tutorial leaving you to sit and wonder "what is wrong?". I realize you are referencing entities without values early on and correct it later, but nowhere in the tutorial does it actually ever explain that. You should really have one of your documentation people go back through this because it is a very bad starting point for new people coming to Unity, at least with the current build and tutorial set.