Prey is now reflected to be smooth across periodic boundary too

evolve-die-repeat/game_manager.gd

@@ -1,6 +1,10 @@
 extends Node
 
 var screen_size = Vector2(1920.0, 1080.0)  # Default screen size (this is a float for some reason)
+var viewport_size
+
+func _ready() -> void:
+	viewport_size = get_viewport().get_visible_rect().size
 
 # TODO: This needs to be called from a script inheriting a CharacterBody2D (e.g. the player)
 # Alternative would be to pass the player reference to this script (which might be better?)