Great question. N-body. Each tick the ship’s gravity is the inverse-square sum of every well and every moving body. Verlet, not a Kepler two-body orbit. (Win checks a Kepler fit in the green ring; that’s the capture test, not how you fly.) Moons on shipped maps feel wells only, no moon–moon pull unless the map is well-less or dense.

Thank you, if you have any suggestions for how to improve it or any features you'd like to see please let me know.