Failure to boot/install on Raspberry Pi Zero W

Hi folks. I'm trying to install Alpine on a Raspberry Pi Zero W. I created an SD card as per the wiki instructions. However, the device appears to never load the kernel. It simply powers itself off after a moment or two. I can, however, use the same SD card to boot Retro Pie with the device. So I'm pretty sure things should work. Can anybody tell me what would cause it to just shut the hardware down instead of say, hanging with a kernel panic or something?

I tried removing "quiet" from the command line, but it doesn't get far enough to even show any text on the screen.

Thanks!