Undead Pixels: Zombie Invasion is a free action game developed by Revolab for Android 9.0 platform. In this game, players must defend themselves against hordes of zombies using various weapons and ammo. The game is optimized for mobile and tablet, providing an immersive experience to players.

The game offers an array of features, including the ability to buy and upgrade weapons, kill tons of zombies, and compete on online global and personal highscores. The 3D pixel art adds to the game's appeal, making it a visually stunning experience. The game is entirely free, making it accessible to everyone.

The game's developers have promised to add new maps, types of zombies, unique weapons, and powerups soon. In case of any bugs or suggestions, players can contact the developers through Facebook or email.

Overall, Undead Pixels: Zombie Invasion is an excellent game for action lovers, and the promise of new features makes it even more exciting.