It can admittedly be difficult to figure out what's needed to progress. You can try the wiki to get hints on what you need to do? https://lustdollplus.miraheze.org/wiki/Main_Page
Is there something specific you're looking for with appearance changes?
There will be more route skips with time. Sometimes it can be complicated to add.
Teleporter is unlikely as a lot of events in the game require you to leave through the area's entrance.
A Portuguese translation is actually being worked on by a fan. Right now I'm focusing mainly on content development. I think around release 100 I will consider putting proper effort into making translations.