I have played through all of them. Every single one is undeniably preachy and cleary centered around the theme. Their mistake is not being more subtle, because few people would go out of their way for playing a preachy game. People actually involved in a abusive relationship would probably actively avoid it, by of the abuser. Even if they were trying to escape, they would probably seek help, not play games. The only way it could help someone is by making the friends of the victims aware, but even then they would have to choose to play a game about it, which is somewhat unlikely to happen.
The winning one, "Grace's Diary", in a very short visual novel with nice aesthetics(IMO) abou a girl trying to prove to that her friend that she is in an abusive relationship and to convince her to seek help. It isn't very interactive, but visual novels don't tend to be.
The second one, "A Decision of Paramount Importance", is kind of interesting. It's about a victim of a previous abusive relationship investigating his new boyfriend's house to figure out whether he is a good guy before they have a dinner. Then she gets to choose whether she stays with him or leaves him. Some elements are randomly choosen, like names, background, weather and the boyfriend's behavior. I think it's nice that the boyfriend isn't always abusive, but it doesn't go beyond that. He is either perfect or a complete jerk and almost every single object in the house will indicate which one he is exactly.
The last two ones have little merit. Either the preachiness was the primary judging value or there weren't any other entries, because they are badly designed, unpolished, amateurish and uninteresting.
Jellia's Friends is a top-down exploration game with shabby art in which a jellybean princess, victim of an abusive relationship, goes to seek her friends. Avoiding the animal enemies is annoying because they are fast and sometimes move unpredictably. Every single dialogue is so artificially preachy it seems to be something taken out of a pamphlet.
The villain is black. How politically correct of them /nitpick
Knowledge can be your bulletproof vest is a generic plataformer with graphics made out of letters in which you have to collect the letters of the 10 signs of stuff or whatever. Boring, annoying and badly animated.
The game incentives you to fall on pits to get letters. Is that the right thing to incite abuse victims to do? /nitpick