There is no priority of tiles. You are free to move to both tiles.
I've been googleing around to figure out how to read the color from the canvas. As it seems that Construct3 uses webgl2 type canvas, this is to work: stackoverflow.com/questions/44070167/get-color-at-position-webgl
Unfortunately, it does not.
I've figured out that Touch.X and Touch.Y will give me the correct positions, but still no luck.
in the preview console I've been trying the following, but in the end I did not get the expected results:
var a = $("mycanvas") // I don't know where $ come from, but it's defined :)
var b = a.getContext("webgl2")
var pixels = new Uint8Array(4)
b.readPixels(318, 498, 1, 1, b.RGBA, b.UNSIGNED_BYTE, pixels)
This should set pixels to the rgba values I need, but it's not set. :(
Any ideas how to read the color from the canvas?