Mojotron: Robot Wars is a twin stick shooter similar to Robotron: 2084 or Llamatron. The game is open source but hard to run due to the old libraries it uses. I've created a kickstarter to help fund open source game development. The kickstarter launches Aug 6th but you can signup to be notified of the launch now.
https://www.kickstarter.com/projects/85 ... robot-wars
Mojotron: Robot Wars Trailer