Chemistry and Physics
by Caelyn Sandel (as Colin Sandel) profile and Carolyn VanEseltine profile
Twine
I'm slightly biased against twine style games, but this is done well, and feels more like a traditional parser-based IF in the interaction and mechanics of the central puzzle.
I think there should be a trigger warning: it is about a violently abusive man, but this is a good game with excellent writing.
Very fair, and very consistent. There were no short-comings or technical flaws I found.