Create a 2D pixel art building game where users create pictures by filling a grid with colored squares. The app should have the following core features: 1. **Template Gallery:** * Display a gallery of pixel art templates. * Each template should show a preview image of the final artwork, its name, and the "GameBux" cost to unlock it. A few simple templates should be free to start. * Mark templates that the user has already completed. 2. **Building Screen:** * When a user selects a template, they are taken to a building screen with a blank grid. * A color palette with all the necessary colors for the artwork should be visible. * A reference image of the completed artwork should be displayed. * The grid squares should be numbered to guide the user on which color to place where (a "color-by-number" mechanic). * Users select a color from the palette and then tap the corresponding numbered squares on the grid to fill them. 3. **Rewards & Currency:** * When a user correctly fills in all the squares and completes the artwork, award them 10 "GameBux". * The user's total "GameBux" balance must be clearly visible in the app, for instance, on the gallery screen. 4. **Data Storage:** * Use a database to persistently store each user's data, including their "GameBux" balance and the status (locked/unlocked/completed) of all art templates.

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