A downloadable game for Windows

Download NowName your own price

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 new enemies! 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 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)

Playable on: Windows 7 and newer versions.

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

Published using Inno Setup 5.

All sales are final.


Download NowName your own price

Click download now to get access to the following files:

ocoa-installer-1_0_0.exe 473 MB

Development log