I cannot give you a demo, for something for which no demo exist.
I had done long ago some test to see if and how I could do some things in ren'py about game mechanics stuff like timed choices (to discover later, that some idea about game mechanics that was new and I liked, in reality existed already in games like "Karryn's prison", though that is not in ren'py) and interface, but never got to what I would call a full demo.
I got into thinking the story for that game and a bunch of other interconnecting but not with Rachel (unless I change my mind on that), and doing and maintaning a patch for another game has allowed me to see better how ren'py works, but I would need to find the time to do the game.
For now, the only things I can give you are a three renders with Rachel as the Green Shadow (one being was an idea for the title screen of the game, but it would change a bit) - "my" Rachel is based on the one from Limpy, with a couple of modifications.
If you notice the bodysuit is thick, it is not by mistake, though its thickness can change depending on some parameters, as well as there would be other clothings for different situations. And the yellow band on the feet will not be there, not with that costume, it comes from something I have hidden but not completely.
The swords are actually the same in the three images, is just that at first I made them, then decided especially having made arrangment for how she carries them, I had to find scabbards I could adapt for the use. The lenght of the handle in the swords links to a characteristic of the swords.
Being Ren'py there would not be a "free change the clothes all the time" as in RPMG, clothes choices would be restrained/adapted to the situation and parameters - even this way, the risk is to have to make tons of renders, in itself something that can kill the efforts, the rendering time with the configuration I have is not a problem, but the preparation for each render (especailly) and the quantity can still be.
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And two renders of two of the other characters that would be important in the game and to some extent would be controlled by the player, or at least, that was and would be the idea, though I may change a bit some details like color of some part of clothes (and animage show the guns, but she might not have them all the time).
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If you wonder, when appearing in the game they will also appear dressed differently, depending also on the situation and how the gameplay goes, but this way I keep a bit the "mistery", though as I wrote already, I don't even know if I will ever really do the game, and I don't know how many of the possible paths, subpaths, and collateral stories I would really put in, if I try to do it and put all of them, it would probably become too big a thing.
Also, yes, I don't actually like the fact almost every game has the "Zeppelin" effect (aerostatic balloons instead of boobs :-D), yet I ended up making all of them rather big breasted (Rachel is the smaller on that side, and she still is not really small, but that was already the case in the original), I would probably reduce the second character a bit in the end, while the third has basically two missiles instead of breasts :-D, but in her case, I may decide not to reduce them - well, assuming I actually ever make the game

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Also notice as you can see in the tentative opening screen I had made, it was not meant as a remake or "parallel universe", there was no explicit reference to the "league" Combin had put in his game, but it is meant to be the same Rachel few years after in a different place, so, a kind of continuation (of course, with some assumptions about the ending of the previou game).
Also, there will not be only one value deciding the behaviour of Rachel and her interactions, there will be multiple.