Hi there!
This a horizontal shmup I'm working on. In fact it started years ago when I've first heard about Gosu. But it was left becouse FPS performance was terrible and also becouse I've realized the amount of graphic work demanded. But for curiosity I've checked the code again some weeks ago and after updating it to latest Ruby/Gosu/Chipmunk versions, it runs pretty fast (I've made a test with around 200 objects on screen, many more than needed by this game, as it will not be a "bullet hell", but something more like older 16-bit games), so I decided to give it another try as now I have a talented friend willing to make the graphics.
All the graphics in the video were found on the internet (credits in the video description) and will be replaced in the game by original work. There is so much still to be done even for this small prototype (like explosions, stage start and finishing, better hud, etc...). In fact I've made the video just to show it for my partner so he has a grip on the action and decided to show it here too, that's why there are just four types of enemies. I'll upload the playable prototype as soon as it is finished.
I hope you like it, somehow, as it's not very polished yet.
http://www.youtube.com/watch?v=d7KeCMGjehsRegards!