iPhone's Sentinel: Mars Defense celebrates Bonfire Night by going free for a week
Remember remember, the 5th of November; outer space, ray guns and war

London-based developer Origin8 is encouraging us all to look toward the sky for explosions and destruction tonight, though it's not talking about fireworks.
It's sci-fi tower defence game Sentinel: Mars Defence is going free for one week from 6PM tonight (November 5th) to celebrate the valiant efforts of Guy Fawkes in attempting to reclaim the government's ill-spent second home allowance.
But Sentinel: Mars Defence isn't a particularly political game (unless you're a native Martian). It's a sci-fi strategy game set on the Red Planet as you attempt to repel the alien invasion by building turrents on the path to your base.
It's sequel, Sentinel 2: Earth Defence, picked up a Silver Award recently, so if you're looking for a few extra fireworks this November 5th, hit the 'Buy It!' button after 6PM (GMT) and check out the first game for free.
