Andorid has only 15 chapters while PC and Mac have 28-29 chapters, and yes these scenes are in later chapters.
The game was initially created in renpy (the android has only been released upto the last renpy release), but now the game is being build in unity and dev was having some issue rolling out android version, the work for the releasing android version is still in progress, you will have to wait till that is completed, or meanwhile can play it in PC /Mac.