It pretty much is if you change her name into "Mom". The dialogue and setting is indistinguishable from a incest game.
Tho as much as I saw, there is no porn content, and only can see your mother naked by peeping on her.
It seems like in the previous verison there was a HJ scene, but that was removed in the current version.
You have to grind like for many weeks on end and all that changes is that you can call your mom "sexy" or "milf" in a few conversations, where she will be pissed off.. Without the grind the actual dialogue/scenes last for at most 10 minutes. With the grind it can take a hour+ to get that 10 minutes of content.
No story progression, and over half of the events that should happen are unfinished.
It feels more like a barebones 0.1 alpha version than a 0.35.
Edit: Each day there are like a TOTAL of 7 interactions with your mother. All of those events have like at most 30 sec -1 minute of dialogue. If you get your stats up, a few extra options will show up for those interactions. But that requires too much grind and is completely not worth it. So 10 minutes of content with 60 minutes of pure grind. I think that this version needs to reach 1.0 before it reaches 30 minutes of content, which will likely require 3 hours of grind to reach.
Try to avoid it if possible.