I read it as mostly being a very short, somewhat poignant, way of saying that life has taken him pretty far from being a sixteen year old kid writing games, but that putting out this game will help him reclaim something that he feels he's lost or is at least at risk of losing.

And that is something that at least some people will feel a connection with, maybe especially people who would care about "Jetpack" in the first place. The kind of people who were once carefree 16 year old video game players, who are probably the kind of people who he expects to be attracted to his Kickstarter campaign.

When brought up in the context of an achievement, being a single [parent] is often meant to highlight the fact that said achievement was realized despite working in sub-optimal conditions (i.e. lack of time).