The characters from the screenshots are from Knackels military base. From the first room, head left and speak to the cat in the junction. This is where I made these screenshots.
There is no content after the final battle with SANIC and SHREK, but since you got there in 10 minutes, you probably skipped a lot of content before getting there by cheating. I am assuming you either used a warp cheat or you used a walk through walls cheat to get to the final boss in minutes, because when play testing it took me 2 hours to beat the game, and I am assuming, if you don't know all the right paths and boss strategies you would need 3-4 hours. If you go back and play as intended, you will notice the massive immersive world, the very unique and interesting Story and the unique twist on the classic turn based combat.