Adulttale

From the letters page: Built in Other, Adulttale by ADULTTALE is an RPG that is ongoing. Expect monster girl, parody and turn based combat with 2D art and animated scenes. The current build is 0.28.0 (201 MB). Available for Windows and Android.

From the box: “After the genocide route, you find yourself alone with Chara in a black void. Wanting to restore your world, you will have to do whatever she asks to do.”