Shader failed to load and render (but works on the website and in other offline tools)

[diovudau]

I want to render this: https://www.shadertoy.com/view/XlfGRj

I'm on archlinux.

First I put the shader into a file myself. Then I tried a different program ( https://github.com/simon-budig/shadertoy ) just to download the script, in case I forgot something, and indeed it downloads more.
This program also can load the shader and display it in realtime. Which is nice, but I need rendering with constant, stable frames per second to a movie even if my computer can't display the shader with enough fps in realtime. Which I hope shadertoy-render can do.

In any case shadertoy-renderer does not compute:

Shader failed to compile:
0:110(53): error: syntax error, unexpected $end