Tooting my own horn a bit here but sometimes nobody else will toot it for you.
This is a game I made and on Saturday it won a Golden Teabag at the IndieVisibility awards so to celebrate I've dropped the price by 50% to $5 on my site.http://www.squidinabox.com/games/waves/
If you buy it from my site then you can either download the installer or use the Steam key that you get sent to redeem it on your Steam account. You'll need to use the Steam key to access the leaderboards though.
It's a twin-stick shooter with Bullet Time and a complicated combo system and 5 game modes (although more are coming in the future).
The trailer is here on the youtubes: http://www.youtube.com/watch?v=HxxOdqKvnpAHere is the review from Eurogamer.