Enabling the night-only mode doesn't do anything and the day-night cycle proceeds as normal.
Have tried it both vanilla and space-age and have tried using earlier updates.

Edit: Seems like there was some conflict with Lightorio? I didn't have it enabled while I was testing but I had installed it previously. Enabling then disabling seems to have fixed it.

I haven't been able to reproduce the issue, with or without Lightorio - as far I know there shouldn't be any conflict there. Any other ideas or pointers as to what could've caused it? I'd love to fix it!

Honestly I have no idea!

I just tried a new game with this mod and switched it to night only to test out how dark it would get. Game began by the crashed ship and it was not dark. I had Peak Darkness Percent set to 90. I'll try again and see if it gets dark after a few minutes.

[edit] Yeah it eventually got dark. So it did not stop time at all. Nor did it start the game in the darkest spot.

Thank you that solves it! I missed that the event doesn't fire when starting a new game. Fixed in the next version!

Until then, you can fix it by changing any mod startup setting after the save exists, that will trigger the event and apply the setting.

I don't know if its the same issue but regardless of what my setting of peak darkness percent is at, it never gets pitch black on night only mode

Could you check if that's still true with Peak Darkness set to 100 without other mods enabled? I haven't been able to reproduce your issue.