Inspired by the all-time classic Space Invaders, Shmattack puts you behind Earth's last line of defense as row after row of alien invaders march steadily downward. Unlike the original, your shields slowly regenerate between waves, giving you a fighting chance to recover after a brutal assault. Bonus waves appear between regular levels, offering a risk-reward chance to rack up extra points if you can survive the onslaught. The aliens speed up as their numbers thin, turning every wave into a white-knuckle finish.

What sets Shmattack apart is the progressive difficulty that scales across levels -- not just within a single wave, but across your entire run. Each level introduces faster formations, trickier attack patterns, and new enemy types that demand you adapt your strategy. The simple left-right-and-shoot gameplay is instantly familiar, but the escalating challenge and regenerating shields add a layer of resource management that the original never had. The chunky pixel art and satisfying explosion effects give it that authentic retro arcade vibe.

Shmattack is part of SHMARCADE, a collection of free retro browser games. Every run is recorded so you can watch replays of any top score on the global leaderboard, challenge friends head-to-head with shareable links, and climb the rankings. It works on desktop and mobile with touch controls -- no download, no install, just pure arcade action.