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Do you have an HD monitor? If so the game is in HD. Many tiny games and demos like this are rendered to a smaller canvas and will either not stretch to fill your monitor or are rendered at a lower then HD resolution.

When people use that term for games, it usually means the assets have been reworked to look better.

In this case, I guess that would be the procedural generation of the background and trees, for instance, to give it better quality than simple triangles.

No, it means the assets have been reworked to support a higher resolution.

That's what I said.

I haven't either but as someone who plays games occasionally, the definition makes sense to me (lots of games don't scale well). Definitely not something I'd have guessed, though.

It's "high definition". Since the graphics are all vector graphics, it doesn't seem to be too far of a stretch. All the rendering will be done at the resolution available.