I was under impression that it's unsafe to write stuff like $ hero.health += 10, and one should use $ hero.mod("health", 10) to check if health is less than all maxes before applying.
No, it's perfectly safe, our character class will redirect it accordingly.
Funny, I don't see BR on github anymore. It was there just a few days ago.
The idea for the repo was to be private, it was for a while and TW was paying for it. We decided to switch to BitBucket which allows private repositories for free. I can add you there if you have an account with them. I just added killer class that inherits from three parent classes so you can do stuff like:
$ nika.stat += 10
$ nika.expr("face_expression")
$ nika.set_flag("fucked_the_capitain")
nika "Hi, I am Nika!"
which will really simplify the development in the future. I must be getting better at this sh!t cause I couldn't figure out how to do this in three prior attempts (one in PyTFall included)

Prolly the most convenient way imaginable to dev the game!
I've also put my PyTFall's experience with image tags to good use

The doll with all the clothing and all the expression is constructed fully automatically from files names and with "exceptions" through JSON file. It's possible to test new shit that was added almost "on the fly" using a special screen and use Ren'Py to recolor any set of clothing (although we're not planning to do that as precolored options that are bound to items are used, could become a thing in the future).
They made a mess of locations, flags and wrote some classes that might have worked in pure python but are not renpy safe, I need to clear that sh!t before story can be developed...