At first, what I enjoyed most was the art—the shaking rocket, the sudden change in lighting when I reached the first planet, and the galaxy in the background.
Then, while flying high in the sky, I died just before reaching a blue area on my third attempt. That suddenly made me determined to beat the game, so I kept replaying it.
Around that time, I also started enjoying the music. It has a simple but cheerful rhythm, and I kept trying again and again while listening to it, hoping to reach that blue area.
It was only near the end that I started to really enjoy the gameplay. I kept wondering how I could reach that blue area, so I slowly explored and discovered items like fuel and explosives.