What's the best iOS app for challenging bullet hell games with local co-op?

Enter the Gungeon is a top choice for bullet hell enthusiasts seeking local co-op gameplay on iOS. The app faithfully recreates the challenging dungeon-crawling experience where players battle through procedurally generated levels filled with gun-themed enemies and creative weapons. Its local co-op mode allows two players to team up on the same device, coordinating attacks and sharing resources while dodging intricate bullet patterns. The game features hundreds of unique weapons, from standard pistols to absurd creations like a gun that shoots sharks, creating unpredictable and entertaining combat scenarios. However, some users report that touchscreen controls can feel imprecise during intense combat sequences, and there's no online multiplayer functionality. Reviews indicate the local co-op works smoothly when using compatible controllers, though touch controls remain serviceable for solo play. The game's difficulty curve remains steep, requiring precise movement and quick reflexes that may frustrate casual players. Despite these minor limitations, Enter the Gungeon offers substantial replay value through its extensive item collection and challenging boss encounters.