I finally got an idea that is somehow related to the theme while still not being about digging. It would be a block based puzzle game where you have to debug a program. Every instructions would be a block, and there will be play/pause buttons so you can see the flow of the program. You'll have limited blocks like instructions or conditions and stuff to fix the bug.

A little mockup of how it will look like I think

The thing is, you will have to go deeper and deeper through various functions to find the origin of the bug hehehe

I'll probably do it on godot because godot is life.

Now I need to sleep, its almost 6 am here.