Can i buy Steam keys for this game?

i will pay those funds.
i want to open up a game giveaway, but directly gifting games to non-friends is currently impossible to.
if it is possible to purchase Steam keys of this game, please let me know how i can do it.

the giveaway is intended for my own live when the version 0.9 is released.

Question was already answered on the Discord, but for posterity, Steam keys are officially available on the Humble store: