It seems that the Teleglitch version from GOG is Windows-only, but the official website says it runs in Linux and MacOS.

Steam also has Linux & Mac native versions, so yeah I'm also curious why GOG doesn't...

I installed and tried to run using wine but it causes unhandled page fault. Doesn't make sense to not provide Linux version since the game uses libraries and tools all existing in Linux.

This was also discussed in the post about the free offering (mid Nov. 2020):
* https://www.gog.com/forum/general/release_teleglitch_die_more_edition_5de94
and from my point of view the non-Windows-users are not glad to be omitted.
This adding points - but being added to the negative list for both GOG and Paradox.
Similar to the DRM problems with online versions and other stuff pretty familiar.

I have asked Paradox but would not be too astonished to get no answer.
If I get an answer I will directly add it at the end of this comment!
It is up to the gamers to make up their mind what they want to get for their money.
And it is our money spent here which provides the free offerings.

On a side note:
It is OK if people try to get hands on games using Wine/Proton - but this is an inferior solution:
or more precisely just a workaround.
A real port is significantly faster, smaller and can really be more stable ...
These ports are provided by several well known game engines automatically.
When we see problems on Linux/macOS than this is no real port - and using any kind of emulator
or layer between calls is no reasonable solution - while it gets more and more common.
Quality costs money ... and if most gamers buy games which have high quality ports one may
see other directions - if this Wine/Proton trash gets really common and accepted we won't see
any ports in future.

On the bright side OSEs (open source engines) are taken care for by communities and are much
better than original releases and work perfectly even more than 15 years after there release.
So it would be a real advertisement if developers/publisher would sell games with a guarantee to
release the engine as OSE after X years (X years about 5 years +/- a few years).

GOG meant good old games - and we get really problems playing current games in 15 years from now.
And seeing 32 bit games released in 2020 and other niceties clearly speaks about neglecting quality.

Similar duty for gaming platforms: if they feel not responsible for directly providing info about missing ports
or about sudden stop of updates for some of the ports, gamers should speak up to stop that behaviour -
if there is some interest in those ports.

Currently a Linux gamer feels less at ease than years before ... and things got worse with Wine/Proton
being set as solution - which this layer is clearly not.
And it should not be the work of gamers asking for port or obstacles/plans.
This is the job of the platforms!
From my experiences a lot of developers care for their games and try to make it available for as many gamers as possible -
while the platforms no longer care and that side was more and more filled by some gamers.
The platforms have just forgotten this fact - and Steam is worse than GOG in that respect.
But both should improve - and there are really many possibilities to improve the situation - but no intention right now:
which is not good - not at all!

----
* ??.??.2020: ... <reserved for any future info - like answer from publisher etc.> ...

I MAY still buy this on here, yet it is kind of disgusting that Linux/Mac versions have been with-held by the publisher for Gog. Again just another case of this store getting second hand treatment from corporations. Well, it works both ways, I may skip the purchase.