Yeah, I noticed the indicators you mentioned but I think you could make them even more noticeable.
I think that the game right now is difficult because of the time pressure since you cannot pause and make paths but I think it would be more interesting as more of a moving puzzle where you are trying to make sure stuff does not collide. So while adding better indications may make avoiding collisions easier, the real difficulty will be having so many space ships it's hard to find a solution where they do not collide. You could even add a timer to the ships where they need to get to the port in a certain distance or else they will starve or something to add more difficulty.
All just my opinion on what I think would be fun though based on playing mini motorways lol.