Exactly what I said before. Sound is a VERY important part of the game.
My two-thoughts: doing sound design when you have a near finished product that isn't going through "potential" redesign is a smarter approach than doing it... well while you're designing it. We have v.6, but unless they've said this is the half way point we don't really know how many more updates we'll have before they decide they are at or about to approach the finish line.
And while I think sound design is important to a game, I honestly can do without sexy sounds since so many other games just use stock noises that are super generic/off putting, so I end up just lowering the volume other than background music. I get that others like it, but not all of us desire it, especially if it's at the cost of dev time for story/girl progression. Love&Sex Second Base for instance is a game I found the voice acting absolutely terrible (though to be fair I haven't checked it in a year), but I get it... some folks dig it - I still think it'd be a smarter design choice to wait till you have a near finished product though.