Nuclear Outrun
An interesting combination of Cyclomaniacs gameplay with Nerdook's trademark intense combat, Nuclear Outrun is a fun physics-driving-shooting hybrid about outrunning a nuclear missile. While lacking in depth, Nuclear Outrun still manages to be a lot of fun, especially once you get the gun that shoots sharks. What more do you need?
Read More
The shark gun might be the greatest thing I have ever seen in a game.
I've kept right on playing after the end of the game, not for any achievement system, but because I want to see what absurdity yet lies in store.
I'm going to echo what Jason said, except that "The Remote Control" may be the greatest weapon I've ever laid eyes on. Once you've escaped once or twice it's kind of repetitive, but I also just kept going out of "Ooh! What's the next weapon?"
Update