Blue's Journey is an action-adventure game where the planet of Raguy is invaded by the Daruma tribe, causing pollution to spread through the city. The protagonist, Blue, is summoned to save Raguy from the Daruma Empire that has turned its inhabitants into slaves.
You control Blue as he navigates through levels, using his leaf weapon to whip enemies upside-down and hurl them at others. Along the way, you can collect flowers to purchase items at a shop, such as flower honey to increase stamina or swim fins for easier swimming. Interacting with other characters can also provide helpful assistance if you tell the truth.
Throughout the game, you'll need to defeat bosses every two stages, and sometimes face a guy in a devil suit offering you a deal. You can accept or refuse these offers, which may grant you rewards such as extra lives, stamina, or flowers. Be warned: each stage has a time limit, and if you run out of time, a black creature will appear, firing missiles at you.