You do not need a specific canvas size to use the technique, it can be used in any size.
In lilac they used a canvas, I imagine it was 1280 x 720, so it was probably a job that took months. It was very hard to make that game, but it's total genius.
But it is proof that wonders can be done in 2 colors, you just have to figure it out.
I have all of these on my wishlist too, ur welcome, all these are pretty amazing.