Samerion is written in #Dlang, which is a niche programming language, and games in written in D are a rare sight. Nonetheless, I'm not the only one, so check this out:
The Art of Reflection. A puzzle game, four years in development, with an in-house engine written in D. Coming out this year!
Demo available.
https://store.steampowered.com/app/2290770/The_Art_of_Reflection/