Hi! Let this be your comment to answer questions and quell fears so you can play this amazing game!
> Is this the real page for buckshot roulette?
Yes! This is the link from the official itch.io upload and it was included in their upload of the game on youtube here
> Is this a scam or trojan?
Nope! It's a false positive flag and it's a documented issue that has happened with other indie development games which you can find on GOG.com, reddit, and a variety of other places that document this.
> Why isn't it free
Because Mike deserves to eat :P
> I downloaded it and it isn't working!
First, export the game from it's .zip if you haven't already by right clicking and exporting to a folder of your choice or somewhere on your desktop than double click the .exe and ignore the virus scan pop-up, as noted previously. If the game isn't working from there, re-download and past that, there are other comments and mike himself who can help troubleshoot.
Hope this helps :D