LoFi SunJu is a 2D arcade high-score game where players must dodge projectiles falling from the sky to survive and accumulate points. The gameplay becomes progressively harder as more projectiles appear, with faster music and larger projectiles. Players can use two abilities: a short dash that grants invulnerability for a brief moment, and a “glitch mode” that allows projectiles to pass through without causing harm. These abilities can be used simultaneously. When players die, they can enter their name into the local high-score list. The game features a dynamic soundtrack where objects like the sun and projectiles react to the music, creating a more immersive experience.

The difficulty increases both over time and based on the music’s speed and intensity. The player’s goal is to survive as long as possible in this increasingly chaotic environment.