Obsidian Echo

*Obsidian Echo* is a vertical-screen endless runner set within a pitch-black obsidian cavern, featuring two parallel lanes. Tap the left or right side of the screen to maneuver your "Echo Wisp." Obsidian pillars will constantly descend, but they contain gaps—you must stay within these openings, or the game will end. A delayed "phantom" traces your previous movements; if you and this phantom collect the same "resonance gem" in sync, you trigger a powerful burst effect. There is no finish line—simply survive as long as you can and keep pushing to set a new high score.