ok, I have already played this in more detail and the truth is very good, (visually it is obvious), but also in general it looks very good, there is duality with the 2 girls (for now), with the mother the love route / corruption and with the sister submission / dominance.
Advice (personal opinion)
1.- A screen of objectives would be good since at times I was lost.
2.- Being a sandbox, it would be good if it were like milfcity or depravity, that is, not "earning points" but directly seeing the event one after the other, this would prevent it from being repetitive.
3.- Since the game has 2 routes (love and corruption or submission and domination) I think that putting ntr would be too much, the MC quickly demonstrates that he can seduce the girls and be a winner, being able to better take advantage of the content to deepen in these 2 routes and that it is worth replaying it, as in SHELTER.
Good luck