I dont know how long have you been watching this game "progress" but, its already third (or forth?) time mulan lies about optimizing development and finalizing art. It never have lead to any actual development speed growth. Quite contrary, after first graphic upgrade he started to post updates 4 times a year instead of 2 times a month, than he updated 2 times a year, and now he is not updating at all. His "updates" is just miniature art redraws that you wouldn't see unless you specifically search difference between versions.
Mulan hadn't added any significant content since 2020. I don't know how his game has rating above 4 and my only guess is that most of low rates just disappears (mine did). Same goes to "abandoned" tag. Without any stable schedule and half a year of absences it should get this tag.