hey uh i got some bad news, the mobile port is completely fan made. someone decided they wanted to make a mobile and ever since then they help Hyao by making the mobile versions, this person however is doing this as a way to help Hyao and he has a life outside that he can't stop to optimize the mobile version.
do keep sharing any issues though since if not mentioned they will never be revealed then hopefully the person can see, and, in whatever time they can give to making the mobile version they hopefully can fix the issues. Autosave is a good idea tho.