According to Cain

The premise for this game is excellent, whether you are religious or not. You are travelling back in time to find out what the mark of Cain was. The game mechanics are also great with many recipe puzzles which reminded me very much of the potion brewing in Gnome Ranger so good stuff! The game has a built-in hint system which answered all my questions. To begin with, I wanted to solve all puzzles by myself but at some point I became impatient because I was very eager to read the ending so I was less patient than usually. So I looked at the hints a few times. However, I never felt the game was unfair though at some point you need to refer to a part of some machinery which was in the protagonist's plain sight but wasn't mentioned unless under very specific circumstances (the spout) so that small bit could be improved.

Parser/Vocabulary (8/10)
Pretty good parser with a few strange responses but that happens rarely.

Atmosphere (9/10)
The writing is really good without being too verbose.

Cruelty: Merciful
I think you can never bring yourself in an unwinnable situation in this game.

Puzzles (9/10)
Great, satisfying puzzles.

Overall (9/10)
This may become a modern classic. It is a great game.