What a kind gesture. Much like with Feep though I hope this endeavor doesn't end up costing you a couple thousand sales. You did do the work after all and deserve to be compensated for your time and ideas. I just wonder if maybe there isn't a better way for indie devs to show appreciation without robbing themselves. I know 50% off coupons are harder to generate than game keys. I am also aware that, yes, some of it is for publicity and to get the game greenlit but I'm hoping that the people that have given it an upvote would have done so without having to have been given the game for free.
In any case! The game looks nice and I will purchase a few copies when it hits steam. Or some other platform if that doesn't look like it will come to fruition. Best of luck and thank you for your generosity.