You clearly have a theatre background like myself and creating a game using theatrical structures is very smart and cool.
It's very very freeform and emphasizes the character playing aspect more than anything. I've read it twice and I'm still a little mixed up on the structure.
What I understand is that you do warm up, create a shared reality, create memory sense and do 5 action move or say something.
I think the only factors I feel is missing is a sense of unified context. Something that really brings all the players into the the scene and allow them to act and react together. A lot of times in improv structures establishing the relationship or shared work spaces or something that ties everyone together presses the narrative far faster and gives players/actors a more enriching reason for being there.
Amazing job loved it.