У вашего броузера проблема в совместимости с HTML5
In this tutorial, you'll learn how to create a simple water shader in GameMaker.
Should work for GMS 1.4 as well, just the "Automatically Crop" option is "No cropping" which should be enabled, and is found in the Global Game Settings.
My assets:
https://marketplace.yoyogames.com/assets/6081/realistic-water-reflection
https://marketplace.yoyogames.com/assets/6111/platformer-water-reflection
Shader Basics:
https://gdpalace.wordpress.com/2017/11/21/shaders-basics/
Reflection tutorial:
https://gdpalace.wordpress.com/2017/08/31/reflection/
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