NVM I found out on Sirens' Twitter that Steam didn't approve it =/ Such a shame they only allow crap games... This would've raised the standards, which I believe is the true reason they didn't allow it. Anyways, I got it on Itch.io now. Thanks Siren for your hard work.
@SirensDomain
ZR1 was deemed too explicit to launch on Steam so that release won't be happening. That also means no updates to ZR1 anymore. I'm tired and ready to move on to new projects.