With Orange you can take an explosive barrel directly to the very edge of the last platform beside the pit with the secret message. Jump directly above the barrel and shoot it with your shotgun, it will send you flying up. At the very top of the wall is a fence that you can grab mid air if you're quick enough. After that you can drop yourself over the wall, but it gets even worse. There's an entire parkour course for you to do, with a lot of dive-rolls and thin platforms, It's basically impossible and just a troll from the devs. I'm not sure if the 5th character is actually at the end or not, but there is this weird white enemy that you can become, but it's not the 5th character.
