It’s got to be the first time that we don’t get a flood of absolutely everyone whining about the theme.

But hey, ‘caverns’ is a great theme. At the same time, you can’t just take ANY game idea and bullshit your way to the theme (as is the case for most themes), and on the other hand, ‘caverns’ opens up lots of game ideas.

Roguelike.
Pitfall.
Scubadiving.
Underground platformer.
Dig dug.

And so on. I still probably won’t be entering, but it’ll be interesting to see what people come up with.