You can play as Shrek by typing "shrek" into chat (T to chat by default). He is large like Big da Cat, but is faster, has a smaller jump, and is Shrek. On the level Flame Core, there is a hidden Shrek statue located down a path to the left near the second to last checkpoint. The run would require you to complete every level as Shrek and visit the Shrek statue.

Thanks and may our ogrelord have mercy on your soul!

Edit: Corrections from Stuoid

Thank you so much! Now I'm coming for your record! ;)

Is there a way to get access to the 1.6 version of the game? Without this access, your current record is unbeatable in Any% because the level skip glitch was patched. Thanks!