I genuinely laughed out loud at "ever since I was a little kid I wanted to press A or D to move left and right" or whatever it was.
I did eventually figure out how to select tools and dig. I kind of wondered if just simply walking down should dig down. Maybe one of the tools can be the non-tool if you want to not accidentally dig.
I thought you were meant to go down so I just kept digging down for a whole minute and found nothing. I had wondered why the coffin would be so deep but I guess it wasn't. It seemed like an interesting idea where if you dig down so much you can't really jump your way back up, so you would have to make your own set of stairs.
Well done all of you!