Hi. Thanks!
Yes, glow does seem to be working on 4.4 with a web build for me. When I release the next version (hopefully in about a week) you should be able to notice it with any of the main colored gems breaking and the particles glowing.
Along with enabling "HDR 2D" in the project settings, right now I am using the following WorldEnvironment settings:
I set the RAW color values of what I want to glow to around 1.3.
The glow actually seems a little more noticeable on the web builds vs the Windows build (vulkan renderer).
Let me know if you need more info or help.