EDITED: 1 year later after playing v1.0.0.
The Veredict: Great game, already an all timer of this still young golden era of indie porn games, much more rewarding gameplay than *other similar themed games that comes to mind*.
The Grind:
At first I tried to play it without cheats. It has several status meter (hygiene, stress...) that you have to maintain constantly by showering, eating, watching porn... That grows pretty boring pretty fast. Fortunately, it has a built-in cheat mode in which you can max up and lock up those stats.
But the "sexual grind" is a different beast. Most of the times you have to repeat a scene 5 times before it escalates (EDIT: this has been greatly smoothed, although It wasn't that bad at the first place, but now its less repetition, and every scene has a slight variation that makes it worth reading again) . Yeah, sometimes it gets repetitive but its essential to the sense of corruption, which is achieved like very few other games had. Mostly through good writing and, specially, through excellent designed game mechanics.
The Gameplay:
When I first played this game *that highly popular game in which you corrupts your family* came to mind. But the core difference to me is that, while in *that one* you progress while doing counterintuitive things in the margins of your routine day, sometimes by chance, sometimes following a walkthrough; in MOTH your grind routine IS the progress. You are always informed when you are progressing. And when you don't progress, you have a self-sufficient hint system (optional) in-game. So while it has some (necessary) grind, it's way way less frustrating.
The Fetishes: i'm commenting only on incest and submission, but there are many more.
-Incest: MOTH has a common "problem" in which incest is severely downplayed. Almost never they mention how weird it is they are fucking being family and all, and strangers make no comment when they know about it. Now, I'm aware that compliance with Patreon TOS is a factor but in the end is a fetish in name only. EDIT: This has been greatly corrected, specially in the mom route. Playing with the incest patch, of course.
-Dom/Sub: My favorite part of the game. It begins as a revenge blackmail that grows sexual step by step (with a couple of very clever expectations defying twists). The MC is not a rapist sociopath, and the first time he gets openly sexual, it has been heavily hinted by her that she enjoys the punishments and that he could (should?) go further. Now, while I enjoy the outcome, I would have preferred a more jerk MC, and a more passive Sub (guilty enjoying it and with less agency, at least at first). Anyhow, this is a matter of personal taste, and the fact still remains that this route, that kickstarts more Sub routes later, is extremely sexy and well done. Really looking forward to see how this fetish would be implemented in his next game.
EDIT: I first rated it 4 stars, but this almost finished version is clearly already a classic. Perfect score well deserved.