Build a Platformer-Runner Game

High-speed side-on courier platformer (flow-state, Sonic-like). Canonical game: Redline. Machine-readable companion: blueprint.json (the Build Plan engine reads it to match genre + order the MVP worklist).

Required asset classes (★ = MVP)

• ★ Sprites — courier (run/jump/air/dash/hit, side-on), platforms + ramps, spike/bar/gap hazards, speed embers, beacon finish.
• ★ UI — speed gauge, time counter, score, chain badge, progress bar. Later: title, results, leaderboard.
• ★ VFX — speed lines, dash burst, ember-collect pop, near-miss spark.
• ★ Music/SFX — gameplay loop + jump (variable pitch)/land/hurt/gem/victory SFX. Later: menu theme.

MVP slice

Jump + coyote + jump-buffer physics → seeded procedural course → spike/bar/gap hazards → ramps (launch) → speed-ember chain (max 5x) → beacon finish → HUD (speed, time, score, chain, progress) → 1 courier sprite set.