彼岸行舟

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 3D endless runner boat navigation game with a Chinese underworld theme called "彼岸行舟" (Crossing to the Other Shore). The camera is positioned behind and above the player's boat at a slightly elevated third-person perspective (position 0, 3.8, -8.5) looking forward along the waterway with a 58° field of view.

The player controls a small wooden rowboat with oars visible on the sides, positioned on a narrow dark waterway (approximately 9 units wide) flanked by raised banks. A ferryman character (hooded rogue in dark robes) sits in the boat holding a long pole, positioned at the back of the boat, animated with an idle motion. The boat gently bobs up and down on animated water waves and tilts left/right when steering.

The waterway is a dark reddish-brown river with animated rippling waves flowing through a surreal underworld landscape. On both sides of the waterway (extending about 60 units wide on each side) is dark ground covered with approximately 1800 red spider lilies (Lycoris radiata/Higanbana flowers) - each flower has a thin green stem and a bright red octahedral blossom with a subtle red glow. The lilies are scattered randomly across the shores with varying heights and rotations.

The sky is a custom gradient dome transitioning from deep purple-black at the top to dark crimson at the horizon, with a glowing red atmospheric effect near the center. A large pale blue-white moon sits in the sky at position (-18, 20, 36) with a semi-transparent blue aura around it. Red-tinted mist sheets (semi-transparent pink-red planes) are scattered along the sides of the waterway, gently swaying and pulsing in opacity.

The course runs from Z position -130 to +150. Obstacles are dark jagged cone-shaped black reefs (18 total) randomly placed along the waterway, each about 1-2 units tall with a dark emissive red glow. Collectibles are 16 glowing yellow-orange soul orbs (鬼火/ghost flames) floating and bobbing above the water at varying heights, each with a warm orange point light creating a halo effect. Each orb gently floats up and down and slowly rotates.

At the destination (around Z=150), there is a dark island with steps leading up to a large red gate structure (two pillars and horizontal beams forming a torii-like entrance). Six wooden poles line the approach, each topped with a glowing orange lantern orb and warm point light. A shrine model sits behind the gate on the island.

Controls: Press and hold left arrow/A key or tap/hold the left touchscreen button (◀) to steer the boat left; right arrow/D key or right button (▶) to steer right. The boat automatically moves forward at increasing speed (base 5.9 units/sec + 0.12 per soul collected), while side speed is 4.3 units/sec. The boat is constrained within the waterway boundaries. Steering causes the boat to yaw and tilt in the direction of movement with smooth lerp interpolation.

Game mechanics: 
- Collect floating soul orbs by moving close to them (within 0.95 units) - each increases score by 1 and slightly increases forward speed
- Avoid hitting black reefs - collision occurs within combined radius of reef and boat (~0.8 units). Each collision reduces HP by 1 (starting HP is 3/3). The reef shrinks when hit.
- Reach the destination gate at the end of the waterway to win

HUD displays in Chinese in the top-left panel: "彼岸行舟" (title), subtitle "穿过彼岸花海，驶向雾中的地府", and stats showing "魂火 [score] · 路程 [progress]% · 船身 [HP]/3". Instructions appear in a centered panel below: "按住左右键或屏幕按钮转向，避开黑礁，收集鬼火". Bottom-right shows keyboard hints "键盘 A/D 或 ←/→". When game ends, an overlay shows victory message "你带着 [score] 盏魂火，平安抵达彼岸" or failure message about being swallowed by mist, with a "再渡一次" (retry) button.

Lighting: Directional moonlight from upper-left casting soft shadows, hemisphere ambient light (purple-pink sky to dark red ground), and a red point light following ahead of the boat. All meshes cast and receive shadows. Rendering uses ACESFilmic tone mapping with 1.1 exposure and exponential fog (color 0x14070c, density 0.017).

Art style: Dark atmospheric 3D with muted low-poly geometric models, deep shadows, atmospheric fog, and strategic use of emissive red and warm orange glows creating a moody Chinese underworld aesthetic. The overall color palette is dark purples, deep reds, blacks, with accent pops of bright red (flowers) and warm orange (souls/lanterns).