A great casual game UI kit with a kind of Halloween/holiday color theme in Figma:

• The easily customizable UI kit
• Buttons and other components with variants
• Google Material Icons as components are included to be easily used in button variants (also you can easily add new icons to be used as new variants, using the free Google Material icons library, or any other icon/vector library)

Icons used:

• https://material.io/blog/google-fonts-material-icons
• https://fonts.google.com/knowledge/glossary/material_symbols
• https://materialdesignicons.com/