I don't really like the current combat. I think you're going for a Rock Paper Scissor style thing and it doesn't work with an HP system like this. It's also a very static system due to Ren'ply and all the attacks follow the same pattern for the encounter, meaning you can prevent damage by metagaming and just dodging the pre-selected attacks.
The Big House intro needs to show of the title character more because it's too focused on other aspects instead of her. Since she has the option to talk to everyone later I don't know why it needs to linger on anyone that isn't Astra. Plot other than that is fine, though people are going to feel lost if they don't know this is a spin-off game with some of the details.
I'm not exactly sure if we're supposed to hate Hor but you honestly did a great job of that if that's the case. I really hope there's an option for Astra to tell him, politely or otherwise, to knock it off that he actually listens to, or makes him so mad that he basically stops talking to her. I know he apparently has a scene with her but the current dialogue makes it seem like that scene would be very forced/out of character for Astra to do and only exists for player reasons.