A downloadable game

One Cannon, One Army

Single-Handedly Save the World from the Alien Invasion!

Only you can save the world!

With the help of your trusty cannon, and your guide, Tucker, you must single-handedly save the planet from an alien army. Shoot cannonballs, fire, and even lightning at the invaders! Collect items and build up your special collection! Craft amazing projectiles! Unlock achievements! And, above all, stop those aliens!

You can keep up with the game's progress on the official devlog, available here.


  • Attack aliens with a variety of projectiles!
  • Play 25 missions!
  • Unlock more weapons and enemies as you progress!
  • Upgrade your cannon and purchase more in the shop!
  • Complete 17 achievements!
  • Collect trophies for your collection!

Additionally, One Cannon, One Army contains subtitles and configurable controls for easier gameplay!


One Cannon, One Army has been translated into the following languages:

  • English (U.S.)
  • Spanish (Mexico)/Español (mexicano)

Help Us Translate OCOA!

You can help translate One Cannon, One Army at https://docs.google.com/forms/d/e/1FAIpQLSeKBj8diFW0Uv5Us80x7WLCIHDB4WHeoCMvvoAoN1lBTA_IoA/viewform. We need assistance with Spanish translations.

Playable on: Windows 7 and newer versions.


According to Purasu's content guidelines, One Cannon, One Army is rated Yellow (ages 8+).

► Violence - Contains violence.

*** One Cannon, One Army is not compatible with Mac or Linux. ***

Coming November 5, 2017!

All sales are final.

More information

Published 83 days ago
StatusIn development
Release date in 75 days
Tags2D, Aliens, Boss battle, Crafting, Fighting, upgrades
Average sessionA few minutes
LanguagesEnglish, Spanish; Castilian
InputsKeyboard, Mouse
AccessibilitySubtitles, Configurable controls, Interactive tutorial

Development log