But then grass just stays the same; and other sprites look floating in empty space.
Also, what exactly is a "scale factor", because there are several scale properties in Construct.
Although I might have misunderstood you, let me test smth and get back to you.
UPDATE : Okay, although a genious idea; this does not work as well as you'd expect :
1. Grass is too small and looks odd
2. Everything now looks as in its floating on grass, not built on it (since grass's scale is now 0.5 when layout's scale is 1.0)
Any way else? Point sampling does the job extremely well, but it results in weird flickering on anything that moves smoothly, which hurts the eyes.