Help in GameMaker

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Hey guys! I have a questions about a shader. The full question is on Stack Overflow here: https://stackoverflow.com/questions/64651360/gms2-drawing-shader…
hey everyone, i think in do a game with gamemaker studio 2, but i no have it actually, someone can tell me where download gamemaker 2?




Big summary of the progress of the project :

Could I trouble you for some critique?
I was wondering if its obvious where the wall is, and where the entrance is in this screenshot.
I can see how its supposed to be fine, haveing made it and all.
Just wondering if it's obvious to others as well
Thanks!

i have a problem some of my sprites have a white outline for some reason