Turns out that Beware of Light doesn't sell many copies not because it sucks (which it doesn't–I have it on good authority), but because everything I've done during and since launch was wrong. Huge thanks to Mark Dawson for teaching newbie authors like me what's what in this business.
So I have until May (when I can escape KDP Select) to fix all the marketing stuff surrounding the book and myself, and hopefully I'll be able to pick up more readers by then. Anyway, starting with June I should have options available that will let me use unholy magic to summon a couple thousand readers. We'll see how it goes.