Just like the comment below me, this kind of game concept is GREAT.
I for one am a sucker for games like this.
For an Alpha build there are small bugs here and there like not being able to save and the movement can be a bit wonky at times when going to different areas sometimes can get stuck, But nothing too game breaking.
The pixel art is new to me but im all here for it and grew on me as I played. The scenery for a Alpha build game is beautiful with its Countryside element.
Some Suggestions:
Some quality of life suggestions for the future you might want to explore on if you want is custom names for the "MC" as well as allowing us to change the aunt name to somthing diffrent then just "Aunt"(also Auntie would be better then Aunt in some dialogue).
In certain scenes with dialogue allow the player to hide the dialogue box to see the art.
Allow us to save (could be a bug) and more save slots.
Content Suggestions:
Im intrigued to see how the farming mechanic will be with a variety of crops but id also like to see the intoduction of livestock to take after as well.
Introduction to more characters in the Town like that one Farmer guys wife or even the "MC" mom comes to visit for a while could be cool.
Fetishes could go anywhere so I'd leave you to that.
As the story progresses perhaps Rika and Auntie as well as other characters base clothing become more skimy as you continue to romance them, perhaps Rika would wear a smaller top to expose her nipples as well as short shorts to expose ass-cheeks or maybe even giving her stockings. As for the Aunt leggings/skirts or stockings too would be nice, give her thongs and myabe button shirts to expose her breasts to the mc.
In some special event scenes Rika and Auntie could wear swimsuits in events that involve swimming, sleep wear for Auntie could be a nightgown with skimmy panties/thong with breasts exposed or covered by gown, school uniform for Rika and a outfit with heels and leggins for Aunt, and of course sexy lingerie for both like heels and fishnets in those really special scenes.