Game Title: Room of Riddles
Theme/Style:  Mysterious, slightly dark fantasy with a focus on riddles and puzzles.
Elements to Include:  A stylized image representing the solved riddle (perhaps a glowing symbol or a key), a score display showing the player's performance (time taken, hints used, etc.), subtle particle effects (like shimmering dust or light).
Text/Message:  First line: "Room of Riddles" (larger font, possibly stylized to look like an inscription). Second line: "You Win!" (smaller font, but still prominent).
Color Scheme: Dark green background, with accents of gold or a lighter shade of green for text and elements.  Consider using a slightly desaturated color palette to maintain a mysterious atmosphere.
Additional Features:  A short, ambient sound effect that fades in and out, perhaps a chime or a low hum.  Consider a subtle animation of the solved riddle symbol glowing or pulsing.