I've never been a huge fan of visual novels but this one is AMAZING! I loved the storyline and the plot twist just made it even better. The charecters and their sprites are also great. You can easily sympathize with Grace and even Anna after knowing what happened to her, wich makes it difficult to make those 2 choices at the end.
Speaking about choices, I felt like there could be more of them besides those 2 at the end so you would be able to interact more with the story, but that's fine. I did all 4 different endings and they were realy good.
The only thing that bothered me was Grace's "secret" about her family and the fact that the game simply doesn't tell you what is it. Also, after she tells Jack about it, that's never even mentioned again wich means that it wouldn't make much a difference if it wasn't there in the first place, so it I fells like it was kind of a waste. But everything besides that is pretty much perfect.
Kill or Love is a great VN and I strongly recommend it.