Really interesting core mechanic - a bit difficult to understand at first, but the first ship to guide is straightforward enough to help understand. I think some additional feedback indicating where the ship is or where the ship crashed, or maybe just where the light is pointing on the map, might be helpful for players as they're figuring out that core mechanism.
Ship 2, though, I found very confusing, and maybe a bit inconsistent at the start of guiding it. In the final section I also wasn't quite clear on where I was trying to guide the ship, either - but the delivery of the story through the one-sided radio communication was really effective and thematic!