The game is still pretty sparse in content, but it can be prolonged and added on to a bunch.
Shower scenes with either male inmates bribing guards or guards themselves going in there.
This could be after a scene where Alice decides to stay in the shower longer after a hard day and she ends up alone, or similar.
The whole sewer thing where you probably already have ideas, whether that includes the escape route you're alluding to, I dunno.
A route where Jeff visits her in prison, blackmailing her into conjugal visits and has her released into his custody as his "servant" could be cool.
Different outfits have already been made so you probably have some ideas there. Maybe extend the warden route and force her to wear considerably less clothes in the daily.
Extend the "bad ending" where Michael isn't cool with it. Show what she goes through.
Pregnancy. Either with the Warden, an inmate or Jeff would be cool.
If you add stuff along the way, make a compendium of different routes you can access in the menu. How many details is up to you, but at least point people in the right direction so they can experience all the content.