Your own art

Everything works without art: the terrain draws the ground, the game draws the ships. When you bring pictures they must be yours, or shared with you under terms that let you publish them (see the rules). Art taken from other games is not accepted.

Ground

• Use the Background studio in the editor: drop one or several pictures, crop and adjust them, and it makes square tiles (64 to 512 px) that repeat seamlessly.
• A tall picture of a whole level can be sliced into tiles: the editor stacks them from the start of the level upward.
• The ground can change during the level (a new tile or another terrain, cross-faded), up to 8 times.
• Up to 2 overlays (clouds, fog) move above the ground at their own speed and transparency.

Sprite cards

A sprite card is one PNG with a grid of cells: one row per ship, and columns for its views (front, left, right, hit). Enemies face down (towards the player); the player's ship faces up. The editor draws cards on the strip and in the preview, so you see the result at once.

Sizes and limits

• PNG only, at most 2048 px on a side and 1 MB per picture, 10 MB per level in total.
• Music: Ogg Vorbis (.ogg), at most 3 MB. Sound effects: .wav, at most 300 KB.
• The field is 360 units wide: draw pixel art at the size it is shown.