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Doesn't look like much but the RP2040 in the cart is drawing those lines and the GBA is DMA-ing the framebuffer over the cart bus.
(There's a lot of DMA going on here)
GIF
Whoa, the notifications 
Probably should've posted the explanation bit...
Sooo... it involves a PGA2040 pretending to be a GBA cartridge using PIO and some... interesting DMA chaining.
The GBA loads some homebrew from the "cart" which then communicates back to the RP2040 through reads/writes to the cartridge area.
Should be a more useful view of the hardware in a previous post, there's some extra cables here for logic analyser usage and from some previous screen hackery.