After the first three options, a fourth unlocks, then after viewing that, the ending is available. It's a bit abrupt because this is more of a demo or proof-of-concept than anything!
Chrome Version 79.0.3945.117 (Official Build) (64-bit)
I should specify, it's not a totally blank screen, they're just all like this:
https://img.itch.zone/aW1hZ2UvNTQ4MTU4LzI4Njg5MTAucG5n/original/2NNKn1.png
Also no dialogue appears in the text boxes below the image, I'm guessing that's part of the bug as well.