in the last 3 levels I introduce another goal to the game which is destroying a certain number of boxes to break a laser barrier to reach the next level sign post. The player will have constant feedback on how many boxes were destroyed in the HUD . The friendly NPC the player met will inform the player of this goal.
Level Design for level 3-4-5
Level 4 will ask the player to destroy more boxes. the level have the door at the end of the level.
In level 5 the player will be introduced to many routes, new enemies and more boxes to destroy. Also the level has a secret room which has a golden box which gives the player 20 points as a reward for exploring.