Ok, so to catch up here: the game is not supported on iPhone. There is a MAC download but that's only going to work on MACs and not the actual iphone. apple has a ton of restrictions to their content and trying to meet all of their demands would heavily censor important parts to the story's narrative so i just generally avoid the apple app store.
that being said, it should work on your chromebook but i also know those can be challenging. you should be able to run the .sh file from the Linux version or it could be possible to run the android version on the chromebook