First of all, it's not a harem as of now. There is no consensual sharing between the girls. Secondly, there are better games. Sisterly Lust, for example. I know the graphics are outdated but the relationship dynamics and lewd scenes are much better. Or Perveteer's new game Tales from the Unending Void. Or Desert Stalker. Just to name a few.
Some parts of the story In Radiant are cringy as hell like the story of the policeman and his wife and also all the girls magically want the MC's dick at the very first sight (which to be fair is not uncommon in AVNs) but they also all magically virgins, even those who have children (we all a bit Christian).
And as far as I remember, more than one girl comes from oppressive puritan family. I mean, it's OK for a porn story but not enough to call it a great AVN.