Solgryn is the creator and final boss of a similar fan-game called I Wanna Be The Boshy. His game was heavily inspired by IWBTG, and made in 'commemoration' of an IWBTG player called Boshy, who claimed IWBTG to be 'too easy'. Really, IWBTB was made to give Boshy 'the finger'.
In IWBTB, Solgryn appears as the World 12 Boss, a giant box of Danish Oatmeal, and is easily considered the hardest boss of the game. For more information, please follow this link: