Everybody ignore my first message. Somebody trolled on my logged in computer in my game dev office, took a bunch of sources from other sources, and pieced them together into one cuz he got bored of doing brute force that all of us have been doing on our break. :P
So yeah, it really is just an eight button code. I asked Phil Fish's programmer. And those square things were originally meant to be secret QR codes, but now they're just easter eggs that go along with those Tome Haikus. Nothing more.