If you're interested in Steam badges, you can use the cards to unlock them.
Here is the list of all badges you can unlock for the game:
If you're not interested in those, you can sell them to earn something in your Steam wallet.
You can earn up to 3 cards, and all you have to do is play the game.
On average, one card will drop every 2 hours of gameplay, but the exact timing is determined by Steam.
This is just another way of expressing gratitude to everyone who has supported the game so far.
Best regards,
Dev Team.
