A vote is not required to win. To enter, vote for Limbo and post here that you've done so or don't and leave a comment here with an explanation of why you won't be voting for it. If you've had a positive prior experience with the game or like what you see, be sure to leave a comment on the wishlist.
Sid Meier's Alpha Centauri + Alien Crossfire will be given away, not on a particular date, but when Limbo reaches 600 votes on the wishlist.
As of the creation of this topic, the votes stand at 410.
Check out my other giveaways:
Consider voting for Antichamber, enter for a chance to win Gobliiins Pack!
Vote for Aquaria, win Deponia!
Vote for Bastion, win Lands Of Lore 1+2!
Vote for Cave Story, win Primordia!
Vote for Super Meat Boy, win Ultima Underworld 1+2!
Vote for Vessel, win Gemini Rue!
Vote for VVVVVV, win Wing Commander 1+2!
Antichamber - Aquaria - Bastion - Braid - Cave Story - Super Meat Boy - Vessel - VVVVVV - World Of Goo