Add level progression and UI updates; implement death screen and marketplace features

scripts/components/exit_door_component.gd

@@ -31,4 +31,9 @@ func on_exit_area_body_entered(_body: Node2D) -> void:
 		return
 
 	exit_triggered.emit()
+	gm.unlock_level(gm.player_state["current_level"] + 1)
+	call_deferred("go_to_next_level")
+
+
+func go_to_next_level() -> void:
 	gm.try_to_go_to_next_level()

scripts/game_manager.gd

@@ -126,8 +126,10 @@ func unlock_level(level_index: int) -> void:
 
 
 func try_to_go_to_next_level() -> void:
-	if player_state["current_level"] + 1 < level_scenes.size() and player_state["current_level"] + 1 in player_state["unlocked_levels"]:
+	var next_level = player_state["current_level"] + 1
+	if next_level < level_scenes.size() and next_level in player_state["unlocked_levels"]:
 		player_state["current_level"] += 1
+		get_tree().change_scene_to_packed(level_scenes[next_level])
 
 
 func quit_game() -> void:
@@ -139,4 +141,4 @@ func pause_game() -> void:
 
 
 func resume_game() -> void:
-	Engine.time_scale = 1
+	Engine.time_scale = 1

scripts/skill_manager.gd

@@ -51,7 +51,7 @@ func apply_unlocked_skills() -> void:
 	for skill_data in available_skills:
 		if gm.is_skill_unlocked(skill_data.name):
 			print("Applying skill: ", skill_data.name)
-			add_skill(skill_data)
+			call_deferred("add_skill", skill_data)
 		else:
 			remove_skill(skill_data.name)
 

scripts/ui/death_screen.gd

@@ -59,4 +59,4 @@ func on_timeout() -> void:
 	if gm.get_lives() == 0:
 		return
 		
-	get_tree().reload_current_scene()
+	get_tree().reload_current_scene()

scripts/ui/marketplace.gd

@@ -21,7 +21,7 @@ func _ready() -> void:
 	var skills_to_unlock: Array[SkillData] = []
 
 	for skill in skill_data:
-		if skill in game_manager.player_state['unlocked_skills']:
+		if skill.name in game_manager.player_state['unlocked_skills']:
 			continue
 		skills_to_unlock.append(skill)
 
@@ -43,9 +43,13 @@ func _input(event: InputEvent) -> void:
 				buttons[0].grab_focus()
 
 
+func get_button_text(skill: SkillData) -> String:
+	return skill.name + " " + str(skill.cost)
+
+
 func create_upgrade_button(skill: SkillData):
 	var button := marketplace_button.instantiate() as Button
-	button.text = skill.name + " " + str(skill.cost)
+	button.text = get_button_text(skill)
 	button.icon = skill.icon
 
 	button.pressed.connect(func () -> void: _on_button_pressed(skill))
@@ -57,7 +61,7 @@ func create_upgrade_button(skill: SkillData):
 
 func remove_button(skill: SkillData):
 	for child in grid.get_children():
-		if child.text == skill.name + str(skill.cost):
+		if child.text == get_button_text(skill):
 			child.queue_free()
 			break