JASEM: Just Another Shooter with Electronic Music has to be one of the most tongue-in-cheek titles for a video game ever. It’s also free to download from IndieGala.
The Steam page has an interesting summary of what to expect: “Do you need any reason to shoot your enemies in game? Because JASEM doesn’t give you one – just you, your weapons, crazy beats and enemies. And you need to shoot every one of them, and it’s up to you to make it the most hilarious and explosive way.”
Visit the IndieGala Store and click on the “add to your library” option while logged in to bag your copy, then download the title from this page. There’s no rush, as it’ll remain free to download from the site for the forseeable future.