game: add xp orbs

scenes/player_stats.gd

@@ -9,6 +9,7 @@ var crit_chance: float = 0.05
 var crit_multiplier: float = 2.0
 var move_speed: float = 200.0
 var attack_damage: float = 1.0
+var pickup_radius: float = 50.0
 
 func get_final(stat: String, modifiers: Array[PlayerStatsModifier]) -> Variant:
 	var base_value = get(stat)