Planet Forge

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 mobile-friendly 3D sandbox game titled "Planet Forge". Show a dark navy full-screen background with a centered, slowly rotating miniature planet made from a flat 9-by-9 square grid of individual raised terrain tiles. Use a high, angled perspective camera looking down at the grid, with soft shadows and fog. Each tile should be a square block with a thin dark blue rim/base underneath and a small gap/dark outline between neighboring tiles. The initial planet is mostly bright green grass, with blue water tiles around the outer edge according to the grid's distance from the center and a few randomly placed forest tiles. Use a low-poly, colorful nature-kit visual style: forest tiles display a stylized faceted conifer/tree and a small bush, while mountain tiles display a low-poly gray rock/cliff prop. Water is saturated medium blue, grass is light green, forest terrain is darker green, and mountains are gray. Light the scene with a bright warm directional sun from the upper left/front plus cool ambient hemisphere lighting, and enable soft cast shadows from the trees, bushes, and rocks onto the tiles. The world should rotate very slowly around its vertical axis continuously.

Overlay a responsive HUD that does not block interaction with the canvas. At the top, place two translucent dark rounded cards: on the left, the large title "Planet Forge" and subtitle "Paint a tiny world of your own"; on the right, a bright mint-green numeric counter followed by the label "life sparks". Calculate the counter from the current grid: each forest tile contributes 3 life sparks, each water tile contributes 1, and grass and mountain contribute 0. Beneath the header, center a rounded dark hint card reading "Tap a tile to sculpt your planet". Along the bottom, show five rounded controls: "🌿 Grass", "💧 Water", "🌲 Forest", "⛰️ Mountain", and a burgundy "↺ New planet" reset button. Grass is selected initially and is highlighted mint green with dark text; the other terrain buttons are dark blue with light text.

Core interaction: tapping/clicking a visible grid tile raycasts into the 3D scene and changes that tile to the currently selected terrain type, replacing its previous prop. Increment an internal painted-tile counter for every paint action and immediately recompute the life-sparks display. Selecting a terrain button only changes the active brush and its highlighted state. Grass creates a plain green tile, water creates a blue tile, forest creates a darker green tile with the stylized tree and bush, and mountain creates a gray tile with a rock prop. The "New planet" button clears and rebuilds the entire 9-by-9 grid, resets the painted count, and seeds the outer ring as water while making the interior mostly grass with approximately 13% randomly selected forest tiles. Make the layout responsive for portrait mobile screens, preserve touch interaction, and keep the HUD styling consistent: translucent navy panels, subtle light borders, rounded corners, pale blue-gray secondary text, bright mint accent, and soft shadows.