Concepts for the background story, inspired by an ancient egyptian myth
The Guardian of the Sun, the playable character carries the sun and travels to the underworld on the sun ship. She fights several dangers with the help of the sun, but gets overwhelmed. The sun ship and the sun both burst and the guardian falls even deeper into the underworld. The now debiliated Guardian has to collect the lost sun shards, gain back strength and find a way out of the underworld.
The sun (or Orb) indicates the direction of target in which the projectiles get emitted. The sprite shown below is in the original scale as seen in the game.