Oh man, how do I even begin talking about this one?
For one, the art is absolutely incredible. I already knew to expect fantastic stuff from the art given what I've seen of the author's previous work, but it still managed to blow me away - the sprites are wonderfully dynamic and expressive (especially Wolf! I was consistently blown away by just how expressive his sprites are!), and in general it feels like this visual novel has a really solid and consistent visual style - it's a perfect blend of detail and abstraction that really helped pull me into the story.
As for the story... I'm definitely gonna have to give this a reread once the full version is out - both to see the other ending, and to try and better understand what goes on, because damn this story can get confusing at times. This isn't necessarily bad, though - there's a fantastic matter-of-factness to many of the details in the story that helps solidify a sense of place, in spite of how fantastical the VN's setting is.
In addition that, I don't think the confusion kept me from seeing and engaging with the main themes of the work (or, what I saw as the main themes of the work) - while the specifics of what happens in the story get murky at times, the feelings of the characters are very much felt, and this story was absolutely a rollercoaster in that department.
I'm waiting on the full version of the VN to be released before I feel like a reread is definitely going to clear some things up, but there's already so many interesting ideas explored here - in particular, the comparison of indulging in the sand with 'perversion' (in particular of the furry kind), and how it shows itself in all the characters. It's interesting that the 'My Wolf' of the game is the most perverted of the bunch, and the one who engages the most heavily with fetishistic ideas (and in musk, no less - a fetish which is particularly prevalent in furry spaces.). On the opposite end of things, you have the owl, who uses the sand (via the artistic medium of the torch) in order to present as her preferred gender, and as her only means of properly communicating with others - it really goes to show both how it can both be used for ill and for good.
Fantastic job! I can't wait for the full version to come out!