For the original Paper Monsters

Crescent Moon's famous Twitter post / Steam discussions / Steam Greenlight page

Hardcore Gamer rundown[hardcoregamer.com] / RPS rundown / good NeoGAF thread[www.neogaf.com]

2012 review for Paper Monsters on toucharcade

Gossip is that upwards of 1500, to as few as 100, copies were sold in a few hours on 03 Feb 2014.

Steam did nothing wrong, and has behaved absolutely wonderfully in this debacle.
It was the discovery that Crescent Moon broke their distribution agreement with Mobot that led to the pulling of PM from Steam.

Please read the links for a much better (and longer) explanation.

PM is being updated to Paper Monsters Recut, with improved graphics, and may soon be available on Steam.

Mobot (old Robots vs Monsters)
Strategy First[strategyfirst.com]
Crescent Moon[crescentmoongames.com]