I'm using the mod and the keystrokes only show grey boxes without anything inside of it.

Steps to reproduce the behavior:

1. Download Mouse Wheelie mod and add it to the mods folder
2. Enable the keystrokes
3. See that the letters don't show up

What keys are you using for movement?

And do the Keystrokes change color when you press them? Or does nothing happen?

Thanks for the report!

I am using ZQSD controls and the box changes color when I press the corresponding key.
Only the letter isn't rendering

This version has your fix https://drive.google.com/file/d/1Zer5xPsVRyydB8vD83VSKqeZVY18bfPF/view?usp=sharing