Jasper by Adam Davidson & Andrew Pollard
Geometry Wars by Bizarre Creations is a very simple but very addictive game.
With its origins based firmly in video gaming history, it owes a lot to its predecessors such as Robotron and Smash TV but ups the ante and brings them firmly into the here and now.
Excellent visuals and simple game play make this a truly addictive game.
Did I simple? Oh, it truly is a very hard game to knock up a decent score on.