@Debs@trd As far as I know there never was a spiritual successor other than of course Lode Runner 2 itself which really wasn't the same thing at all. I think licensing issues caused the Lode Runner games to fall into an IP limbo or something and somehow somewhere along the way everyone seemed to have forgotten about these games.
I have seen a recent "3D" Lode Runner appear on the Switch, but IMO it wasn't any fun at all. I'd still consider Sierra's Lode Runner game to be the best of them all personally.