Rail Rushline

Cinevva's analyzer read this game's design doc and its source, then wrote the brief below. "Make your own" hands it to the game creator as your opening message, so you start from a real spec rather than a one-line idea.

Create a browser-based 2D canvas endless runner titled “Rail Rushline,” presented in a stylized flat geometric/vector-art look. Use a forward-facing, centered perspective down three converging railway lanes: the player runs toward the camera at the bottom center while the track vanishing point sits around the upper quarter of the screen. The background is a minimal urban rail scene with a teal-to-sand sky gradient, a pale sun/moon circle, distant blocky dark buildings, overhead utility poles and a horizontal wire, and a broad dark blue-gray track/ground. Draw three pairs of perspective rails and repeatedly scrolling transverse sleepers/ties to communicate forward motion. Alternate between daytime and darker blue nighttime palettes based on distance, with a lime moon/night accent.

The player is a simple blocky runner: peach circular head, dark cap/hair strip, bright orange-red rectangular shirt, dark navy legs and shoes, and a lime horizontal shirt detail. Keep the character anchored near the bottom of the track while allowing three discrete lanes (left, center, right), with smooth interpolation when changing lanes. The game is an endless run: distance continuously increases, speed starts around 13 and ramps gradually up to about 25, and score increases with distance, multiplied by any active score boost. Spawn randomized obstacle/item patterns ahead on the lanes, moving toward the player with perspective scaling. Spawn patterns should include: orange-and-white low barriers with dark feet, tall dark trains with orange tops and cyan windows, lime horizontal signs on poles that require sliding underneath, strings of gold coins, and glowing cyan star power objects. Ensure at least one lane is generally safe in each pattern and place coins in safe lanes.

Core controls: Arrow Left/Right or A/D switch lanes; Arrow Up, W, or Space jumps; Arrow Down or S slides. Also provide on-screen touch buttons for left, jump, slide, and right, plus swipe gestures on the canvas (horizontal swipes switch lanes, upward swipe jumps, downward swipe slides). The player can jump over most hazards, slide under the tall horizontal signs, and must avoid trains/barriers/signs or the run ends. Use lane overlap and forward-distance collision checks. Add a brief landing particle burst, coin sparkle particles, subtle camera shake on failure, and simple Web Audio beeps for start, jump, coin pickup, landing, power effects, and game over.

Coins are gold glowing discs that can be collected in the matching lane; track run coins separately from the persistent wallet, add collected coins to persistent currency when the run ends, and show the current run coin count in the HUD. Include temporary glowing power effects represented by a cyan star: magnet pulls nearby coins toward the player, jetpack lifts the player above the track and provides hazard/coin behavior, sneakers increase jump strength, a 2x score multiplier lasts about 12 seconds, and a board provides temporary protection from collisions. Show the currently active effect as a cyan badge. Persist wallet coins, best score, mission coin progress, and a rotating daily counter using localStorage.

Build the interface around the canvas with dark translucent panels, lime accents, orange/cyan highlights, condensed bold display typography, and a futuristic rail-runner aesthetic. On the main menu show the RR mark, large “RAIL RUSHLINE” logo, subtitle “RUN THE LINE. OWN THE NIGHT.”, a runner preview card, wallet and best score, a prominent lime “RUN NOW” button, MISSIONS/SHOP/DAILY buttons, and the tip “Swipe to switch lanes • Jump over hazards • Slide under signs.” During a run show a pause button, mission chip such as “Collect 35 coins,” centered SCORE readout, run coin pill, and active power badge. Escape or the pause button opens a pause dialog with RESUME, RESTART RUN, and MAIN MENU. On collision, show a results dialog with score, coins, distance, RUN AGAIN, and MAIN MENU. Add informational overlays for missions (Coin Line: 35 coins, Night Runner: reach 900m, Clean Landing: jump 8 hazards), a shop showing the active Rook runner and locked Pulse/Fern variants with prices, and a daily reward panel with a rotating local coin reward. Keep the game responsive to full-window desktop and mobile screens, with the HUD and touch controls adapting on smaller displays.