Echo is a spatial Canvas game. Move with a mouse, pen, arrow keys, or WASD. On touch, drag from anywhere to steer relative to where your finger lands; lifting pauses after a brief grace period. Collect apertures and avoid delayed copies of your movement. A brief double aperture is worth two points, but choosing it closes the standard target too. Music and position cues begin only after your first input and can be reduced to effects only or muted. Accepting consecutive double-aperture offers builds a Resonance chain; declining an offered one releases the chain without changing score. The visual playfield remains essential. Rare Signals can be earned by deliberate movement motifs or recovered as optional field artifacts; they never change score or collision.