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About game
Build a squad of cheerful aliens and defend five lanes against comets, crystals and meteors. Your defenders shoot automatically, while you decide who to recruit, where to place them and when to merge.
Combine two matching defenders into a stronger one and develop your squad up to rank eight. Each wave brings a tougher challenge, and every enemy that breaks through costs a life.
Spend earned coins on permanent upgrades to damage, income and health. Your upgrades and best wave carry over between runs. Find your formation and see how long you can survive!
How to play
Click the recruit button to buy a rank-one defender. Hold the left mouse button and drag a defender to a cell. Each defender fires only along its own lane.
Drag one defender onto another of the same rank to merge them. The maximum rank is eight. Defenders of different ranks swap places. Dropping outside the board cancels the move.
Stop enemies before they reach your base: each breakthrough costs one life. The lightning button opens permanent upgrades. Use ×1/×2 to change battle speed.
Pause and sound controls are in the top-right corner. Press Escape to close the upgrade shop or resume a paused game. When you lose all your lives, a new run starts automatically.
Your goal is to survive as many waves as possible!