Yes the game is still being updated.
Plucky little post-apocalyptic MMO Xsyon has released its latest update with a long-awaited feature: pets. Players can now feed and tame creatures in the wild which are capable of following basic orders and can be kept and displayed in player-built stables.
Xsyon’s creature AI had previously been completely rebuilt with combat being more responsive and with newly implemented parry and dodge action. Creatures can now breed, grow powerful with age and experience, migrate, and mutate.
To celebrate the new update, Xsyon is on sale for those who have yet to buy it. Check it out.
Source: Press Release
(Minor disclaimer: I was briefly an unpaid GM on Xsyon nearly nine years ago. I doubt anyone at the company remembers me)