In this game you play as Onion Boy, a little man with an onion head. He flies a plane over the city when alien saucers appear and start attacking. Can you defeat the alien ships with your bombs?
You can also just destroy the city if you'd prefer to do that. Hopefully the mayor doesn't mind the collateral damage since you're defending the earth from aliens.
EDIT: For reasons I'm not sure of, firing bombs doesn't seem to work in the browser version on Firefox or Chrome. It does seem to work in the version on the browser in Voxatron itself though. If I can figure out and fix whatever the problem is, I'll be sure to put out a new cart version.