No Mercy (v0.9) is a well-crafted non-consensual visual novel centering on a cheating stepmother who becomes blackmailed by her (step)son. While there is a "love route," the blackmail/rough path is more in line with the game's title and the core of the narrative.
The game includes some minor ntr elements, such as a mandatory blowjob scene in the introduction, which is essential for the story to unfold. If such content is too distressing, it may be advisable to skip this visual novel despite its overall appeal. (I'm not an ntr fan myself, but the intro scene is the justification for everything else and therefore tolerable in this case. NTR is not the main focus of this vn!)
Because of the vn nature, the player must make decisions that lead to various outcomes. To access all scenes and achievements without excessive trial and error, a walkthrough is recommended. (Without it's likely to miss content.)
The dialogues are mostly convincing, and the plot, aside from the aunt/stepmother's sister subplot, is engaging. The aunt's storyline feels rushed, as she seems to pursue the main character too quickly and without sufficient build-up. This can detract from the realism of the game for some players. However, the main relationship between the MC and the stepmother progresses more naturally and is better-written.
Graphically, No Mercy employs Daz3D models and includes animations that enhance the erotic scenes. The visuals are generally well-balanced with the text, avoiding excessive reading. There are no textwalls or endless inner monologues and most dialogues in general are meaningful. Also the dirty talk never gets ridiculous.
The only significant graphical issue lies with the stepmother's character design; though she is described as 37, her visual representation appears to be much younger, which can be disappointing given the context. Especially her face looks like the one of a young woman in her 20ies, and clearly not like a mature woman being close to 40 years old.
Unfortunately this is a common critique in the realm of visual novels featuring MILF characters, who happen to look like young women in their 20ies.
Despite this flaw, I can confidently recommend No Mercy. It delivers a compelling experience that is well-managed in terms of pacing and erotic content.