Another happy player here. Nicely executed and appropriately challenging, but not too frustrating. The last puzzles really made me think, especially the very last one (if I remember right, it took me 40-50 minutes). Also nice to know about the free Advent calendar version, now I know what I will be doing with my TheC64 Maxi when waiting for Christmas :-)
The only thing that I would change would be the length of the game (the 100 levels are solved faster than I thought), but this is not really an issue, as the game cleverly has support for DLC content.
One question regarding that: when and where there will be some available (besides the Advent version)? Also, what will it cost? I would love to solve some more, I think this concept works even better here than on the traditional pen-and-paper format!
Thank you for this game, it is well-done and entertaining! :-)