Interesting game! I think my basic mandarin probably helped me out a bit so it didn't take me long to finish it.
When arranging the calendar, I noticed that some of the interaction highlights were overlapping with other columns, and some of the romanization text needs to be scaled a touch.
Also, the crossed out numbers on the calendar did force me to do a bit of counting to remember the correct solution for the puzzle.
But overall, very fun. I definitely think it definitely had the right balance of difficulty for a game that doesn't tell you anything at all!