Little Regina is one of those true Adult Games. It has some sex, but sex and smut is not the main focus of the story.
You play as a retired soldier that got captured and tortured, and a lot of the game deals with the consequences of that to him and his psyche. In many games with similar MCs, he would be this indestructible terminator, that has no flaws and no shortcomings, however Little Regina dares to give us an MC that has flaws, suffered an awful and tragic event, and carries the scars, physical and mental, from that period of his life.
The same is true of all other characters in the story, the main LI is not perfect, she has her own past and dark story, and has flaws as well, but all of this makes her more human and believable.
The secondary LIs or secondary characters are treated the same way, with each of them having strengths, flaws, moral dilemmas they need to deal with and that humanize them.
The story is also relatively original and has some really creative aspects to it. I loved the idea of the music changing depending on what the MC is feeling at the time, even though it can be a bit heavy handed at times it is a very creative way of using the music and gives you more of an indication of how he is processing whatever is on the screen at the time.
The use of the cat and his cat-vision is also a fun little touch to the story and shows how each character is perceived depending on how they behave on different situations. I found it really creative and well used to give you some extra visual cues of the story/action.
Overall I would recommend Little Regina if you want to read an adult novel that deals with some very heavy and dark subjects, you do not mind a bit of gore and explicit violence, and are not too concerned about there not being sex every 5 minutes.
I really liked all of this and felt really engrossed in the story and the characters and would recommend this to any of my friends even if they didn't play porn games (as I do not see this as a porn game, whatever that is). Totally worth 5/5.