[Update]: Blasphemous' final free expansion has now arrived - Wounds of Eventide.
After Blasphemous' rather chunky free DLC "Stir of Dawn" launched back in August, I figured that's pretty much it for the Souls-like action-platformer. Thankfully, it would appear that I was completely wrong as the The Game Kitchen and Team17 have just returned to announce that Blasphemous is now available on both macOS and Linux!
Much like the rest of the multi-OS games on Steam, if you already own one copy of Blasphemous, you'll be able to play it on all three platforms. As for what exactly Blasphemous even looks and plays like, that you can find out through the freshly posted launch trailer. Have a peek:
If you're still on the fence, it's also worth mentioning that Blasphemous has a free demo on Steam. It's not terribly lengthy, but it'll clue you in quite quickly on just what Blasphemous has to offer, and more importantly, if it's even your type of game.
Have fun, and if you're looking for a few more tidbits of information, you'll find what you seek over at the official website.