Twinline v0.1.0 — first playable prototype

Twinline v0.1.0 — first playable prototype

Two circles connected by a rope, one shared camera, and two players on one keyboard.

Download Twinline-macOS-v0.1.0.zip, unzip it, and open Twinline.app. Runs on macOS 12+ on Intel and Apple silicon; Unity is not required. The app is ad-hoc signed and is not Apple-notarized.

Controls

• W: solid circle. Up Arrow: hollow circle.
• Tap to lift. Hold the same key longer to pull closer. Release to swing apart.
• Space: begin or retry. Escape: pause.

Try pulling in the safe opening playground. Both circles must pass each tube. Every gravity reversal gets a large two-second countdown; the same keys then lift against the new gravity.

Included

• Shared-camera monochrome co-op flight
• Progressive physical rope reeling and preserved momentum
• Gravity warnings, scoring, pause, and retry
• Unity source project and validation results

Validation
Two deterministic 36-tube routes, 18 advance gravity warnings, continuous hold/release, rescue, pause, and clean restart passed. Eight gameplay states were rendered and checked. This is an early playtest release; rope wrapping and rope/tube collision are not simulated, and the movement still needs human co-op feedback.