I wrote a game in HTML and JavaScript called Daleks. It's based on a game I played when I was a kid with the same name, which is in turn based on an old BSD game called Robots. Check it out!
http://www.isaacsukin.com/sites/daleks/index.html
Update: Apparently I tested this so much while building it that I got really good at it. Played it for a few hours without losing until I got tired and gave up at level 100 with a score of 53940. I had a really productive day! If you can do better (without cheating) by all means send me a screenshot.