I just tried to find a game called MURI on GOG but the search came up empty.

The developer is Ludosity who previously released both Ittle Dew and Card City Nights on GOG.

When I checked the developers site it only mentioned a steam release as a purchase option.

I could have sworn I'd seen a DRM-Free release being sold somewhere, but it appears that unfortunately I may be mistaken.

Judging from the videos I've seen of it Muri is a 2D game done in the style of Duke Nukem 1 as if it had to function based on the hardware limitations of the time.

For the curious here are a few links to a review and a commentless gameplay video along with a vid of Duke Nukem 1 so you can compair the two game's similarities.

Review:
https://www.youtube.com/watch?v=Qp-WeTNbLzM

Muri Gameplay:
https://www.youtube.com/watch?v=RMbg5gISTEw

The original Duke Nukem's Gameplay:
https://www.youtube.com/watch?v=c4a3_wazRPA

Here is the GOG Wishlist entry for Muri:
https://www.gog.com/wishlist/games/muri

Since the developer appears to also be the publisher of this title and already has two games released on GOG, perhaps MURI will also find its way to a release here.

I've played it, it's pretty fun but short. The graphics are well done too, looks like an early 90's EGA DOS platformer right down to the pixels.