I beat the game. Does anyone know if their is any post-game content?

Nah, it doesn't save when you beat it, so it treats you like you haven't won. There IS the secret item, though, if you haven't found it.

What is it?

We won't tell you the details since THAT'S the secret hush-hush easter egg content! But I'll give you a hint. Use your Stopwatch often and you'll come across this message (see pic). Find him first!

But I defeated him already.

You didn't mistake Giant Bones (the boss, every player will fight him) with this Master Bones (easter egg, not all of us will find him), did you?

Oh, OK.

What is the key for this program?