There is no Mac version, I don't know why seeing as it is clearly advertised on the cover, but I'd guess that they're working on it.
This guy started deleting review comments on Game Jolt, and I guess he felt the need to move to itch, and thought that nobody would notice.
That is incorrect! The correct answer is, "What are, minimum system requirements?" Jokes aside, I recommend about 3Ghz and 8 Gigs of RAM. Minimum may be 2Ghz and 4 Gigs of RAM