Steel Storm is a nice shoot em up. Episode 2 is on sale. You can play for free the Episode 1.
Note: The downloads include the game and patches.
Steel Storm Ep1 Windows
267.1 MiB - 158 downloads
Steel Storm Ep1 Linux
317.6 MiB - 120 downloads
Steel Storm Ep1 Mac
321.1 MiB - 110 downloads
* Deathmatch and coop game modes;
* Exploration and time-trial gameplay types;
* Score driven gameplay – master your skills to stay ahead;
* Intelligent AI knows no mercy;
* Hordes of enemies to destroy;
* Vast numbers of destroyable structures and obstacles;
* Huge territories to reclaim;
* 6 missions of various difficulty, for beginners & hardcore gamers;
* Edit or create your own missions with SandStorm in-game realtime multi-user editor (will be released as a patch for Episode I).