I am developing a speed runner friendly shmup which I just made available for download. Even though its only a portion of the content, the levels that are there represent a good spread of what to expect in the actual release.
You can download it here...
http://www.pythetron.com/download.html
and if you register, you can play online and compete on the leaderboard here...
http://www.pythetron.com/leaderboard.php
I'm really hoping to find players who would be willing to offer suggestions and feedback. Either here, or my email feedback@pythetron.com