Question Sprite Glow Shader not Working in-Game

So, I created a Shader for a sprite glow in Unity. However, even though it seems to work just fine in-engine; whenever I play the game, the glow gets messed up.

In Engine:
In Game:

I used Bracky's tutorial (here), and I followed it exactly. Is there anything I might have missed?

Any help is appreciated. Thank you!

 

"In Engine" isn't very clear. There's the Built game and the Editor. Within the Editor, there's the Scene and the Game. "In Game" could mean in a built game or within the Editor pressing Play. Below I assume you mean Scene vs. Game in Editor.

What's the MainTex look like?
What's the Emissive texture look like?


In your scene is that box checked on?

What are Global Volume's Bloom settings?
What are the settings on the Material's HDR color?