I'll add this to my watchlist and monitor. I guess the first thing I'd be interested in would be "routes" - specific characters you can eventually reach an ending with, rather than the story going on indefinitely. It'd especially be interesting if this could involve different dynamics.
Second thing I'd be interested in would be how the story can develop the protagonist's traits over time.
I know there seems to be a big market for body and mind transformation games so that's something to consider if you just wanna reach that audience.