So - I entered the lowres jam, uploaded to gamejolt, then realised I have a problem, because it's native 32x32, I wasn't thinking about needing to upscale for it to be visible.
Running as fullscreen it's fine, but yeah, embedded, it's not scaled - so it's icon sized.
http://gamejolt.com/games/arcade/32-bullets/27208/
Is there a way to upscale an embedded canvas within the html?