Good to know I didn't miss my calling as a cartographer.
That was a genuinely unique mechanic that I've never seen before, and it seemed pretty faithful to how maps were originally made long ago. It's a perfect fit for the theme in more ways than one which is awesome!
I'm not sure how the map was implemented... placing vertices on a polygon maybe? It's a pretty impressive feat of programming so kudos for that!
The map itself was pretty cool too, and being full 3D really helped the idea shine even with basic low poly style graphics.
The complete lack of sound was a bit of a downer. I think it would have really made the experience more immersive to hear some waves and seagulls, and maybe the ground crunching under my feet.
Still, high marks from me! Very well done.