Saw this in the 1up 101 Free Games article, and had a go last night 
http://www.harmotion.org/
It's good fun, you can play standard levels, and at times detect a human opponent, then face them in a head to head battle.
Different ships have different weapon types, plus you get drops.
Stages are populated by blobby things thatyou shoot, which leave behind energy which you can collect by either flying over, or drawing towards you with your tractor beam, and they cause your weapons to increase in power.
Took on a few randoms before bed last night, managed 3 wins in a row.
Honourable mention to De Blob as well, single player game that is quite weird, but very enjoyable
http://www.fun-motion.com/physics-games/de-blob/
http://www.harmotion.org/
It's good fun, you can play standard levels, and at times detect a human opponent, then face them in a head to head battle.
Different ships have different weapon types, plus you get drops.
Stages are populated by blobby things thatyou shoot, which leave behind energy which you can collect by either flying over, or drawing towards you with your tractor beam, and they cause your weapons to increase in power.
Took on a few randoms before bed last night, managed 3 wins in a row.
Honourable mention to De Blob as well, single player game that is quite weird, but very enjoyable
http://www.fun-motion.com/physics-games/de-blob/
