That's an appropriate face while trying to make fire with a hand drill. First time he actually struggled with anything at all. For all of one page, before he got help.
Wood is actually surprisingly fire resistant, especially living wood, since there's moisture in it.
He thinks he's clever for using leaves to sleep on? Lots of animals do that.
The power to make things grow into any shape he wants, with a few bits of metal added on.
The biggest concern at the moment is probably food preservation.