KBop a doo said:BreakBacon said:its been a free game on steam for ages, actually relatively difficult for casual play
You might possibly be thinking of a different game because this isn't a free game. It has been on Steam for several years but it is a purchasable game, not free-to-play. Unless you just mean you personally got it for free/cheap at some point, which is of course plausible because of all of the bundles and giveaways. Or played a free browser version or something.
It was in Humble Indie Bundle 12, and so he might have gotten it there. I did, and while it isn't the sort of game I'd pay for on its own, it is quite fun to play.