I'll just contextualize the "1 light-minute" distance for everyone: ~18 million km. The extent of the gravity well for 1 Earth gravity: 1.5 million km ... or about 1/12th of that. Carrying that through to its logical conclusion has some pretty disastrous consequences for narrative & gameplay.

That number seems just a few orders of magnitude more severe than intended (which is why I used planetary radii earlier).