Precision jumps, platforms, and combo coins in a neon skyline run.

Controls
Build an HTML5 platformer in a single file (HTML/CSS/JS). Theme: neon skyline at sunset with soft gradients and glowing UI. Core loop: run -> jump -> collect combo coins -> avoid enemies. Mechanics: double-jump, moving platforms, checkpoints every ~30 seconds. Controls: Arrow keys or A/D to move, Space to jump, R to restart. UI: score, lives, combo meter, and a short tutorial panel. Win condition: reach a finish flag OR survive 60 seconds.
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