Hi there CGS, welcome to the forum!
The game is developed with the AGS engine, so it will run on whatever system AGS supports.
Windows will work for sure, I also successfully tested it on Android some time ago.
Native AGS has Linux support, but I am not sure if this is really a 100% thing and we haven't tested it so far.
Luckily ScummVm now also supports AGS games which increases the platform support even further.
One thing I have noticed with MMM episodes on different platforms is that there is always a problem with MIDI support.
But since NotM does not use MIDI, this should not be a problem.
However, it is hard to say on which platform the final game will work when it is released.
We will see it when we get there.
I hope that answers your question.