Pixel Space Sandbox Engine

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=== SHORT DESCRIPTION (под названием) ===Pixel-art HTML5 space sandbox with gravity, collisions, supernovae and black holes.=== PROJECT DESCRIPTION ===A pixel-art space sandbox for mobile and desktop browsers, built with pure HTML5 Canvas and JavaScript in a single file, no engines or dependencies.What's in it- Place and throw planets, gas giants, stars, pulsars, black holes and quasars; tap any body to edit its mass, size and type- Gravity with orbit forecasts, collisions (merge, crater, shatter), tidal disruption, supernovae, hypernovae, kilonovae, black hole and quasar mergers- 3 modes: Realistic, Arcade (scenarios), Creative (custom gravity, time and physics switches)- 10-step interactive tutorial, trails, sound, Solar System presetStatus: playable prototype (vertical slice). Not published, no revenue. Needs saving, achievements and platform integration before a commercial release.Selling the full source code and commercial rights to one buyer. DM for a playable build or preview video.=== HOW THIS PROJECT WAS BUILT → OTHER ===Pure HTML5 Canvas API, no game engines or libraries. Single-file, lightweight and easy to modify.=== OTHER TECHNOLOGIES & SERVICES USED ===Built as a physics-focused project: gravity, collisions, supernovae, black hole accretion disks and gravitational waves in a pixel-art simulation. Currently a playable demo (vertical slice), never published or used commercially.