Biped is a game focused around cooperation, so while it may technically say it is singleplayer in the store page, I imagine it is best played with someone else. I won't stop you from entering if you plan on playing singleplayer, but please at least check the store page before you enter to make sure you think you'll enjoy it enough to warrant the entry, y'know? :)

To save you looking through the region restrictions, this one is through humble, and they noted that only people from China would not be able to redeem this. Sorry folks.

Good luck!