Really fun entry, building up a little narrative with changes in the gameplay was great and effectively made for a slightly creepy vibe. Point of feedback is that you've got subpixels going on in animation/motion meaning it does not strictly adhere to the nokia resolution limit, but otherwise your intent is clear and authentic! :)
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It can be tricky to achieve especially when you actually want to have the game playable at a larger resolution. I'm not familiar with (modern) GameMaker, but possibly you can lock the resolution at which your game renders to 84x48, then have that output be scaled up in the browser. In Unity, I have the game's camera output to a render texture of that exact resolution, then scale it up x10. I'm sure there's other GameMaker users in the jam that could share their solution!