Because this game uses IllusionSoft property to create its visuals, posting it on Steam is against Steam TOS. So I can't. Also I think Steam demands 30% of sales, so even if I could put this on Steam, I don't know if I'd want to.
You're more than welcome to get the newest builds on release here, on Patreon, or on SubscribeStar :)
Those are my only avenues to distribute the game currently.