I picked this game up when it first came out on disc and I regretted never finishing it. I was thrilled that it showed up on Steam and I'm very happy my memories of the game weren't just nostalgia, it's very fun and polished. The tone and puzzles are reminiscent of classic LucasArts games and the art is top notch, even by today's cartoon game standards.
Some have not liked the voice of Mona, the main protagonist. It is high pitched and I can see how it could annoy folks but I thought it fit and didn't mind.
Yes, the game ends on a cliffhanger and a sequel hasn't been made - yet, but don't let that put you off, the game that's here is still great. Plus, the creator, William Tiller, has been looking at creating a prequel and possibly a sequel though the initial Kickstarter campaign
didn't pan out.
I personally didn't have any problem running the game on Windows 8.1 64-bit. I also tried it on Windows 10 and in that case had to launch the game by clicking on the executable instead of through Steam.
I think if you are a fan of classic point-and-click you'll like A Vampyre Story.