That's a great question that even I don't have an answer too but, they might email you the code not sure what time should be before Jan 25th and I think you might need a backers badge to play or get a rank on discord to unlock chat witch is part of your contribution. This is what the Moderator said
Noveltease Official Moderator
Badges are not being done at this time. The Devs are focusing on the game as it is a higher priority.
If you payed you still get a key, no worries.
So if the badge is imported to you which is should be because, you payed for it then good luck bud.