While you acknowledge the plugin is “excellent” in functionality, your 1-star “Awful” rating seems disproportionate for a single customization preference.
We provide many features at no cost, and color customization is possible through CSS variables – a standard web development approach. Though you may not be comfortable with CSS, this doesn’t make the plugin “awful.”
If you need help with customization, probably something of these could help:
1. Post your question in our support forum
2. Check our documentation for solutions
3. Consider suggesting this as a feature request
No logic in such review at all.