Hello! Thanks for your interest in Stacks On Stacks (On Stacks). This was meant to be a very small beta (~50 paticipants) but it appears it really took off with many people signing up. Please wishlist the game on Steam to hear about it when it comes out:
https://store.steampowered.com/app/510430/Stacks_On_Stacks_On_Stacks/