breadth-first traversal of grid is working!

an array of token groups is calculated successfully
and it's probably fast enough.

project.godot

@@ -14,3 +14,16 @@ config/name="combo-car"
 run/main_scene="uid://bai2mcthexgm5"
 config/features=PackedStringArray("4.4", "GL Compatibility")
 config/icon="res://icon.svg"
+
+[input]
+
+activate={
+"deadzone": 0.2,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":32,"key_label":0,"unicode":32,"location":0,"echo":false,"script":null)
+]
+}
+
+[rendering]
+
+renderer/rendering_method="gl_compatibility"
+renderer/rendering_method.mobile="gl_compatibility"