HTML5 is distorting pixels, but is fine on Desktop.

[narrow zephyr]

First picture is how it should look, and it's how it looks running on the desktop. But when I test the HTML5, I get what happens in the second picture. The project is running at a resolution of 84x48, with a frame rate of 15, and a shader forcing the colors to two shades: all meant to emulate the look and feel of the Nokia 3310. I've poked around at a lot of different settings, including V-Sync and viewport stretching, but nothing seems to solve this issue. Anything I can do?

[narrow zephyr]

I've just discovered this is partly due to the shader, though I'm still not quite sure how to fix it. When I turned the shader off and ran the HTML5, this happened:

Also, I forgot to mention: I'm using Godot 3.5.2. Probably should've mentioned that sooner.