Planet Defense

Can you hold the line when the alien swarm darkens the sky? Rotate your planet's cannons and blast every invader before they crack the core.

You're a lone planet armed with a rotating turret, and the alien fleet is not here to negotiate. Click to fire, drag the mouse to swing your cannon, and don't let anything touch the surface. That's the whole pitch, but the execution keeps it tense. The first minute feels manageable—lone scouts drift in from the left, easy pickings. Then the screen starts filling with split formations, armored cruisers, and fast little pests that slip past your shots. I kept getting greedy, trying to clear one side while the other flank collapsed. Lesson learned: keep the turret moving in small arcs, not wild swings. Each hit pops with a satisfying burst, and the planet's health bar shrinks fast enough to keep you honest. No fiddly upgrades or menus, just your aim and reaction time. What really clicked for me was the rhythm of it. You stop thinking about individual enemies and start anticipating spawn patterns—three from the top, two from the right, a fast one from the bottom. The screen turns into a clean, brutal math problem where your only variable is mouse speed. It's the kind of browser game you open for a five-minute break and then realize you've been defending for twenty. And when a swarm finally breaks through, you'll feel the exact second your strategy fell apart. Perfect for quick sessions with zero friction.

Mouse to move click to shoot

Prioritize fast enemies before they reach the planet; they deal chip damage fast. Use short, controlled mouse arcs to track multiple targets instead of chasing one across the whole screen. Click rapidly for low-health enemies but save sustained fire for armored ones. Watch the spawn edges, not your cursor—enemies telegraph which side they're coming from. Don't ignore a side for too long; symmetrical threats will punish tunnel vision. If you get overwhelmed, focus fire on the closest enemy rather than trying to clear a whole wave.

Q: Is Planet Defense free to play? A: Yes, it's completely free in your browser with no hidden fees or premium unlocks. Q: Can I play Planet Defense on mobile? A: It works on touchscreens, but mouse control gives you much better aiming precision. Q: Do I need to download anything? A: No download required—just open the page and start defending your planet. Q: What are the controls for Planet Defense? A: Move your mouse to aim the turret, click or tap to shoot incoming enemies. Q: Does Planet Defense have levels or endless waves? A: It uses endless waves that get harder over time, so your score keeps climbing. Q: Is there a pause button in Planet Defense? A: Clicking outside the game screen usually pauses, but the game itself has no pause menu.