Is the completed tag correct?
Also I'd like to try this, could anyone share the linux build if it exists?
Yes. The game reached it's official final version some time ago with the addition of the female player character.
One DLC came out later (at least one still to come) and it still gets function updates however.
Eek is planning to add the holiday decorations in form of DLCs, so players can deactivate them. A simple switch in the options would do the trick for me to be honest. But the data structure of this game is ... not ideal.
No Linux build, everything but Windows 64 Bit has been abandoned.