Love the design of the little sister 10/10. The teasing is off to an amazing start I hope it keeps that same vibe for a while until a massive payout. Also, the kind of blue-Ish lines on the thighs when she bends over? A1.
Great start =). Don't over-worry too much about going back and fixing every little error, especially considering it is your first game and a vast learning experience. Rework is a good way to burn yourself out. You've done a great job of giving your MC and both sisters actual personalities with very little dialogue or exposition. Some games take multiple updates to accomplish that haha. Looking forward to 0.2
