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Defend against relentless waves of cubes and deadly bosses in FireLine: Merge Defense! Combine weapons to upgrade your cannon, strategically positioning yourself for ultimate protection. This engaging 1-player arcade game offers a unique bounce mechanic and a satisfying difference in gameplay as you tackle increasingly challenging levels. Upgrade your arsenal and dominate the battlefield with tactical precision. Easy to play online with just a mouse click. Experience the thrill of strategic defense and powerful upgrades in this addictive HTML5 clicker game. FireLine: Merge Defense,defense game,cannon upgrade,cube defense,boss battles,arcade game,HTML5 game,online game,1 player game,clicker game,mouse control,tactical defense,merge game,weapon upgrade,bounce mechanic,challenging levels