Simple, but fun when you figure out the pattern.
Hi! thanks for playing mine! I had to return the favour :)
I think your is intriguing and as a pretty good track, but I personally don't know what HCF is and don't have a guess. Maybe it will work better with a longer game experience? (as in more options to get branching messages).
Love the unexpected twist, although I really should've guessed it from context clues. It's obvious in retrospect.