Pixel-art 3D floating-island funfair with a physics roller coaster

GOAL: Make a pixel-art 3D diorama of a funfair on a floating island, the same series and engine as my other pixel dioramas (three.js, orthographic isometric camera turned in quarter steps, small render target with no anti-aliasing snapped to whole pixels, depth-based outlines, a fixed 64-colour palette matched in OKLab, hard sun shadows, day/dusk/night, rain with puddles). Call it “Lift Hill”. MOTION: The fair: a wooden roller coaster with a chain lift hill, a turning first drop, camelback hills and a banked turnaround, built on a white timber lattice of bents, ledgers and diagonal braces that reaches down to the grass; a station with a striped roof, a numbered sign and a switchback queue. Around it: a Ferris wheel whose gondolas hang free, a chair-swing ride, a carousel with bobbing horses, a bumper-car arena under a spark grid, a cotton-candy stall, a popcorn stall, a balloon seller, an information booth, a photo booth, a bulb-lit entrance arch, lamp posts, benches, round trees and conifers, and a fence along the edge of the island. Real coaster physics: the train runs on a spline sampled by arc length. Each step it feels gravity from the slope under every car, rolling friction and air drag; the chain grabs it on the lift and its anti-rollback dogs hold it there; trims, brakes and station tyres slow it and park it. The track is banked from its real curvature and the speed a dry run predicts. Riders feel the actual vertical and lateral g from the speed, the curvature and gravity: they lift their arms and float off their seats in airtime and lean into the turns. Offer three layouts (Classic out-and-back, Twister with a helix, Hyper with airtime hills) and a lift-height slider. If the lift is too low the train does not crest a later hill, rolls back, gets stranded in the valley and is towed over by maintenance. Show speed, height, vertical and lateral g, the energy head against the next hill and a prediction for the chosen lift height. Other physics: Ferris gondolas are pendulums driven by the wheel’s acceleration, so they swing when it starts and stops; the chair-swing seats find their angle from the spin (tan θ = ω²r / g) with lag; bumper cars are rigid discs that collide with impulses, bounce off the walls and spin, with sparks. Life: visitors walk the paths, queue for the coaster in the switchback, board in order, ride with their own shirt colours and walk off at the exit; parents walk with children; a child sometimes gets lost, the PA asks the grown-up to come to the information booth, the parent goes there and then to the child; umbrellas come out in the rain. Bulbs along the track and the rides light up and chase at night, lamp posts light the paths, and fireworks go off. Tap the ground to let a balloon go, tap at night for a firework, tap the station to dispatch. English UI; must work on phones.