Ha, I've been working on some similar projects in the past couple of weeks! (Although I was aiming for a much, much darker screen.)

Here are my design/dev notes:

https://untested.sonnet.io/Obsidian+for+Vampires

https://untested.sonnet.io/Night+Rider

The idea to work on this was partially inspired by stargazing apps, e.g. NightSky.

I'm still not 100% if these experiments are worth pursuing (I need to pay rent) but if you'd like to see a tool like this, or if you have any use-cases I didn't mention, please let me know.