Unfortunately, we did have to wait a while (more than four years) but the third installation of Killgar and Hogstrong adventures is finally available on Newgrounds https://www.newgrounds.com/portal/view/724905
Harry Partridge already launched a Patrion in hope of finishing episodes 4 and 5. You can find that here: https://www.patreon.com/harrypartridge
Worsemovies 