Ozone Guardian

Ozone Guardian is an arcade shooter in which you defend the ozone layer from groups of enemy spaceships. Enemies grow more numerous and powerful each round, and every five rounds you face a large boss. You control your spaceship with the mouse, moving it to the cursor’s position, and shoot upwards with a click or by holding the button to fire continuously.

Rounds and upgrades

Your dodging and timing affect your score at the end of each round. You spend points in the Space Shop on upgrades that build your spaceship’s capabilities, including power, size, speed, flame shots, homing shots and spread shots. The shop adapts to your income and which upgrades are available. You can buy small improvements each round or save points for higher-level upgrades; the choices you make shape your ship as later rounds become harder.

Ships and enemies

You can choose from a variety of starting spaceships, each with its own benefits and traits. Enemy ships are randomized and have different attack styles in each round. Bosses have distinct skills that test your dodging precision.

Modes and scores

Casual sessions take 5–10 minutes, normal sessions 25–30 minutes, and hard sessions about an hour. The three difficulty modes offer different levels of challenge and suit different amounts of available time. Global leaderboards show records and statistics for other players’ sessions, and let you compare your best sessions with players around the world in each category.

Soundtracks

A selection of background soundtracks ranges from soothing music to upbeat tunes.