Click the screen to navigate Dr Green Alien through the space adventure. Pick up the toxic waste barrels to earn points. Avoid obstacles and enemies that may hinder your progress. Reach the finish line with the required number of barrels to conclude the level. Utilize the arrow keys or swipe gestures to maneuver Dr Green Alien in different directions. Be cautious of the poisonous barrels and plan your path carefully. Advance through different levels, each with distinct challenges and layouts. Improve your precision to maximize your score and unlock new levels.