Sethian may be purchased at:
Steam: http://store.steampowered.com//app/432370
itch.io: https://gqul.itch.io/sethian
Q: Is the itch.io version DRM-free?
A: Yes.
Q: Can I purchase the game from you directly?
A: Unfortunately not. If you’re a “support the devs” type of person, I recommend you purchase from itch.io.