For v0.2.1:
I really wanted to like this game, because I like the brother-sister approach, and also the combination of your little sister with NTR, but... it's just not a very good game.
I know that these games usually don't have an outstanding story so I won't judge the game too harsh on that aspect, even though I think the game would benefit from a slower build-up with some more teasing. It feels somewhat rushed at this point.
But what this game is mainly lacking are decent visuals. The renders are very simplistic. Rooms consist of some basic furniture, empty walls without decorations or windows, and barely any details or textures. It feels 'cheap' and low-budget.
Also the little sister should be the crown jewel of this game, but I don't think she looks very cute or beautiful. She even looks a bit creepy sometimes, like they used an adult model and put her head on a child's body.
Lastly there are still some major bugs in the game. For example, when you go gaming with your little sister, you later tell your mom that you went to the park. And if you want to take your sister with you when visiting Daniel, you end up leaving her at home instead.
Overall, this will probably be a nice game for people who are really into brother/sister incest and NTR, but otherwise it's not great.