The app's color scheme is very heavy

Quick answer：

The term 'heavy' in the context of an app's color scheme typically refers to a color palette that is dominated by dark, rich colors. This can create a sophisticated and modern look but might also make the app less visually appealing or strain the eyes, especially in low-light conditions. Designers often use a heavy color scheme to convey a sense of seriousness or luxury. It is important to balance the color scheme with sufficient contrast and whitespace to ensure usability and readability.