Slip Space -- Despite knowing that I'm not a cognitive gamer, I tried to buy the game anonymously, using the "GameBoomers Review Sale" link you provided, and somehow it must have identified me as a non-cognitive gamer, because the link gave me an error message!!!
I bow to your formidable programming and identification skills.

I finally used a cached version to purchase the game for $17.99. This saved me (I think) $99.99 off the price that would be appropriate for me -- though I may be overestimating, as I can't subtract either.
Downloading as we speak.

EDIT: The link is now working again!