It's been great to see how their games have inspired so many people. If you go search any of the subreddits for their games, it's not rare to see testimonials of how the game "saved their life". It helped them learn to believe in themselves. To believe that they can change and overcome the challenges that are facing them, things they previously despaired were insurmountable. To use terminology from the Dark Souls series, they were hollow and through mastery of the game they were able to reverse it.
Although they didn't have quite such an effect for me, these experiences nevertheless have built confidence that I otherwise wouldn't have. Just because something is difficult, just because I don't understand it now, doesn't mean it will always be that way. If I keep at it, if I think and experiment enough, the thing at hand becomes legible and one day soon, doing that thing that used to be so hard will become second nature. It's an empowering experience.