Last Line is an action-packed side-scrolling shooter with base defense mechanics and cartoon-style graphics. Players control a tough-looking soldier who defends a fortified position from waves of bizarre and monstrous enemies using a variety of weapons and explosive abilities. Between battles, players can explore and upgrade their underground base, manage characters, enhance equipment, unlock skills, and collect rewards like chests and bonuses. With a mix of strategic planning and fast-paced shooting, this game offers both casual fun and deeper progression elements to keep players engaged.