Poom

"Poom" is a first-person shooter game set on a Mars base where the Union Aerospace Corporation has accidentally opened a portal to Hell. As the last human, players must fight their way through hordes of enemies to escape. The game features top-down shooter gameplay with different control options for desktop and mobile devices, and may require a powerful browser or device to run smoothly. The Linux version can be downloaded and played by unzipping the archive and changing the execution bit.