Hey thanks for checking it out @jbobrow. I was kind of assuming, given the hoops one needs to jump through to play around with it, that this project was just for me 
Having the sunlight pulse every so often might be a nice effect, but certainly not as often as it does now.
BTW, once I go asymmetric and have more code space, I plan to try to tackle the whole “tiles must be oriented the right way” thing. It’s a super annoying restriction that just isn’t good UX.
How did it crash? Hopefully with a “stack overflow” error code (4 red blinks)?
Yes exactly right. Thankfully it started blinking red as soon as it was done programming, which made for quick iterations while I was narrowing down the limit. Of course there’s a chance that some other, less used code path might overrun the stack more easily, but I think I’ll be fine as long as I stay far away from the limit I found empirically.