This seems like a very clever concept for a text-adventure.
The colors used were pleasing to the eye and the fonts were large enough for easy reading.
The flying envelope animation is really nice.
Clicking through the texts with the left mouse button (or pressing an arrow key) was pretty simple, and most of the time I could press an arrow key at a red dot intersection to pick a new direction, but I could not figure out why I would get a "try again" message when I was on the last part of a branch. At those points I could only go straight so I couldn't figure out why I was "dying". Instead of just a "try again" message, I would add a note about what the player did wrong. "Try again (you didn't turn in time)" or "Try again (you picked the wrong branch)."
I also couldn't tell what the point of the different branches was. Are they different text responses? Are the ones that are harder to get to "better" than the ones that are "easy" to get to?