I think so. To me, the best stories seem to be those that can make us laugh and cry, because they're so full of truth, as cliched and cheesy as that sounds...ahem. But yeah, laughter is definitely powerful stuff.
In any case, I'd recommend trying out all of those at some point, if you haven't already; they're all great games :) Through Time is on this site, and Tin Star and Choice of Robots are both available on choiceofgames.com, though not for free unfortunately (I'd also recommend Zombie Exodus and Slammed!...and, though I'm personally not a big fan of it, the Heroes Rise trilogy has a lot of uplifting undertones).