Renders quality looks nice. Females models are decent; but the dev was lazy and used the same face for all the family members (even the MC) with minimal changes, which results in a very feminine looking MC. I don't know if in the banner, the girl opposite the MC is his sister or supposed to be a transformed/sissy/gender-bent version of himself, but they have the same exact face, along with the blonde in the 9th preview pic.
Sandbox sucks because: it's rarely implemented well, it can easily become a cumbersome and grindy experience, early in the development there's very little content to warrant a sandbox, they end up feeling disjointed with the pacing and story-telling, or they're linear and never needed to be a sandbox in the first place, and it can also be used to pad playtime for a very bare-bones experience.
The Overview tells us nothing of substance. It's needlessly verbose but ultimately a fluff piece to inform us that is a VN with choices and consequences. -_-
Incest + NTR, again with this shitty song & dance. A true fan of Incest would never mix those two together. They're conflicting themes. There's a reason the latter kink is the most polarising one on this site. Most games with this ill-conceived mix focus more on the latter; either way, development time will be split between both of these paths, so ultimately the players will have to wait longer for their preferred content.
Incest/Harem is "probably" the most popular genre, purely going by the number of games with those tags, and as a reason we get many of them flooding the market, so something sub-par like this can be easily avoided.