Source: assets/Ships/alien_ship.jpg (40 ships, 8 columns × 5 rows).
atlas.png was prepared with the built-in ImageGen editor. Designs are adapted
from the original sheet; ImageGen may redraw small details.
Prompt: Remove the gray checkerboard and replace it with real transparent alpha;
preserve all 40 dark alien ship designs, red/magenta colors, original ordering,
and crisp silhouettes. Arrange exactly 8 columns × 5 rows with isolated craft,
transparent margins, no text, no shadows, no background. Face ships upward.
extract_sprites.ps1 slices the returned atlas, trims transparent margins,
corrects remaining sideways/downward orientations, and centers each sprite
on a transparent 256 × 256 canvas with a maximum occupied dimension of 224.
Run this PowerShell script to rebuild alien_01.png through alien_40.png.
The catalog in scripts/items/alien_ship_catalog.gd is shared by the level
generator and game. Each system selects one design using its level and seed.
All enemy tiers use that design; elites retain their tint and bosses their size.
