In prototypes/entity/resources/fix.lua

added at start of function resource(resource_parameters, autoplace_parameters) :

local gfx_size, frame_count = 38, 4
if resource_parameters.name == "y-res2" then gfx_size, frame_count = 40, 8 end

And swapped in stages width and height to gfx_size, frame_count to frame_count

stages =
{
  sheet =
  {
    filename = "__zJatmnYiFixes__/graphics/entity/resources/" .. resource_parameters.name .. ".png",
    priority = "extra-high",
    width = gfx_size,
    height = gfx_size,
    frame_count = frame_count,
    variation_count = 8,
  }
},

Ofc it's not perfect because the sprite shadows don't fit in their frames but it's much better.

Thank you for the feedback!

I do agree it looks a lot better. I will include this change on my next update of this mod.

updated in 0.2.12