What is DELTARUNE REALLY about? | DELTARUNE Analysis

Deltarune is fundamentally about the philosophical conflict between accepting predetermined fate and exercising free will to change one's destiny, even at great personal cost. The game presents a prophecy that foretells the roaring will summon titans and three heroes will save the day at a great cost, yet the player character (the soul) is uniquely free to defy this prophecy through the 'weird route' in Chapter 5, which diverges from the normal route by defying key prophecy elements like the girl with hope crossed on her heart. This creates a narrative experiment where Gaster, the game's god-like figure, observes whether players will choose to accept their fate or tear freedom from its clutches regardless of the consequences.