Well, the theme is – quite literally – a joke, so I’m adapting my favourite concept (was hoping Climbing or Colossal would win), which was a tower-climbing game. But it IS dangerous to go alone.
I might introduce an AI character so you’re NOT alone, as in Ico or the Prince of Persia second reboot (the toon-shaded one). But that will be a HELL of a lot of work, so you may just end up being given a useful tool instead.
It’s gonna be hard to ensure that my procedurally-generated tower is in fact climbable, so an alternative could be having the old man pop up providing “cheat” items when you get stuck halfway up the tower. Er…old men can levitate, you know. My grandad does it all the time.