I updated the game with controller support, timed matches, and an AI defensive bot that gets in your way. The robot interactions are rather buggy (weird things might happen if you get pinned), so there's a link to a version without enemies if you don't like it.
Clear the cache if you've played before.
Html5 with enemies:
http://applepi.tk/swerve
Html5 without enemies:
http://applepi.tk/swerve_noenemy
Desktop with enemies and controllers:
http://applepi.tk/swerve.jar
Controllers don't work in html, I haven't figured that out, so use the desktop version if you want to use a controller.
Tested on a Logitech Gamepad F310. Left stick for translation, right stick for rotation, LT and LB for harvester, RT for shoot, A for field centric, B for robot centric, D-pad for move rotation point, back for reset rotation point.
And it wont let me update the first post to add the links... There's no edit button