Solid bullets were blocking the patrolling enemies, so the field now defaults to solid = false: each bullet is a plain StaticBody2D with no collision layer, plus an Area2D that only detects the player, so nothing is physically obstructed while contact still costs a heart. Ring radii changed from [5, 10, 15] to [3, 6, 9]. Damage is now applied every frame to whatever is overlapping, not only on body_entered, so standing inside a bullet keeps hurting instead of only the first touch. Also picks up the editor change that removed Walker_03.
The user did not want anything firing: the bullets should simply exist in the air as fixed obstacles. bullet_ring (the emitter) is deleted and bullet_field takes its place. bullet_field generates concentric rings of frozen bullets centred on itself, radii given in cells (default 5/10/15), and skips bullets that fall outside the level bounds or land inside solid tiles so nothing is buried in the terrain. Each bullet is a StaticBody2D on the world layer, so it blocks the player and can be stood on; damage defaults to 0 (pure obstacle) and can be raised to turn them into hazards.
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