Early 0.1 review...
Promising, but very familiar premise and storyline.
Numerous issues with "aunt" being lowercase throughout - both as a formal pronoun and at the start of a sentence.
Several issues with sister, cousin, and aunt names being default and not the variable for a custom name.
Abundant typos (missing letters, missing words, spelling) including the Witner/Winter name at her intro.
IMO - Needs more visual work in transition moments and start of scenes. Specifically visiting sister in her room has 10 or so lines of description of her without her visible at all. Visiting mom in her room describes a lot, but has the same unmoving, unchanged still shot of her standing there. More animation/poses would be appreciated.
As a fellow game dev, I get it. Every single render/drawing takes a lot of time to get perfect. What you have is a nice template. It just needs more fillers and in-betweeners.
It's a nice start, in general. Based on previous work, the promise of amazing things is warranted. I hope these tips have helped in some way. I didn't want to list all the specifics. I'm sure that's already being looked into for the next patch.