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Game Graphics
Overall vibe of the visual aesthetic.
Color Palette
What kind of color scheme are you planning to use? Dull, desaturated colors? Lively, vibrant colors?
How will they be applied to the game objects? Will they be silhouettes? Will they be outlined? Will they be shaded? How so?
Is there an existing work or two you want to draw from?
Stylistic Attributes / Effects
Any particular visual motifs (signature shapes/effects) you're planning to incorporate into the overall style?
Cute, round shapes? Aggressive, harsh triangles? Obscured silhouettes?
What about design languages? Should enemies or hazards be of a certain color or shape?
What about to call attention to specific parts of the game? Nostalgic film noir, tense wide angle cameras, glitchy static?
Any visual influences (cultural, setting)? Mayan, celtic, post-apocalyptic dystopia, alien, etc.?
Effects
What kind of visual effects are you going to need for this game? Motion blur? Bloom? Film noir?