The first prototype boards came back from OSHPark, and they mostly work. There are a few tweaks to make for the next one.

Firstly, it turns out the boost converter I'm using doesn't actually have the output shut-down functionality I thought it did. So instead of that, I'll just use a MOSFET to shut down the input from the battery.

There's also a little bit of ghosting in the LEDs. It's probably not enough to matter, but adding pull-downs on the anode side MOSFET drains fixes it.

I'm also going to switch the next prototype over to using an SPI flash chip for the audio samples instead of an SD card.

Meanwhile, the initial cut of the software works. I need to do some tweaks here and there to tighten things up a bit. The game should start playing the patterns back faster the further you go, and I need to work on varying difficulty settings, but the code is up and available for folks to play with.