I recently participated in a game jam where I made a shmup, and spadgy suggested I post it here to see what you think of it. It's a bit rough around the edges, it was made it only 48 hours, but maybe you'll enjoy it.
It's designed around mouse control, so that's what you'll need to use.
Right now it's playable in a browser here, with the unity web plugin, and there'll be a downloadable Windows/Mac version some point later this week.
We only tested it on 16:9, not sure what it'll do at other resolutions.
There's an online leaderboard too

I should point out that although I did much of the design, audio design, titles screen and other stuff, I was partnered with a coder who did most of the heavy lifting.