Hi Shaun,
Thanks for checking out my game! I ran it both on windows and HTML5 without error, did you download the code from itch or did you clone the git repo? I'll have to check but I thought I had the most up to date code zipped and uploaded.
Anyway, trying to create my own streak shader without looking at others was a difficult task for a shader rookie like me. I can see where shaders can be really useful and I plan on continuing my learning.