Save The World By Left Clicking Your Mouse At Exactly 10 Seconds!
Aliens! Clicking! Time! Explosions or relief depending on your skills!
I made it this afternoon/evening, after scrapping my original idea and unfortunately not working on my game as much as I wanted.
All good though! 
Made in Unity/Playmaker
http://www.ludumdare.com/compo/ludum-dare-27/?action=preview&uid=21024