Apparently my game is that you have no arms and need to jump on top of a hyperactive jackhammer to smash blocks and avoid them getting too high.

This is the kind of thing that happens when you brainstorm for 2 hours, get no idea you're happy with, and just start building something.

This was horribly unfun when it was 9 tiles wide and the jackhammer jumped around randomly. Now that it follows you like a puppy and the space is much narrower, I'm starting to find some fun. One interesting tradeoff that I've noticed is it's easy to quickly eliminate blocks if you dig straight down, but if you go too deep it becomes difficult to get the jackhammer out and reposition it quickly to deal with the tall piles that risk hitting the game over line.

It's a very cool part of these jams that you can throw any pile of mechanics together and there is something hiding in there. You don't get to decide, you just have to roll with it.