Happy Gunman is a lighthearted shooter where you guide a cheerful character through waves of targets and obstacles. Auto-run through colorful arenas while tapping to shoot in the aimed direction. Each wave introduces new enemy types, from shield-bearers to bouncing bombs. Collect ammo upgrades and health packs dropped by defeated foes. The cartoon aesthetic uses bright primary colors and exaggerated ragdoll physics when enemies are hit. A weapon wheel lets you switch between pistol, shotgun, and rocket launcher mid-run.