Operation Monarch is a free Android game developed by MindlessBrain in the action subcategory of games. The game is a classic 2D vertical scrolling shooter that requires players to defeat 100 levels of insect-like aliens. It offers players an action-packed and addictive gameplay experience, with big boss aliens to destroy, explosions, and everything you would expect from a game of this genre.

The game has achievement badges to be won and coins to be collected for upgrades. Players are required to drag their fingers across the screen to move and fire their ship, while tapping the mega blast button to hit everything at once. The game also offers power-ups and upgrades to help players defeat the harder-to-kill aliens. Operation Monarch provides 200 levels to play, and players can pay to remove ads and get unlimited levels.

Overall, Operation Monarch is a great and simple casual shooter with a leaderboard to conquer, and is a must-play for anyone who loves classic 2D vertical scrolling shooter games.