The Backrooms are an Internet meme at this point, it's a classic, and I love that has arrived to Minetest. As soon as I saw this entry, I instantly downloaded it.
It does not disappoint:
The "classic" backrooms level captures the spirit of the Internet meme well. It's how I would have expected it: A yellow infinite chaotic mess of walls. The ceiling lamps hum terrifyingly. The game does not seem to care too much about "conforming" to SCP lore.
It is not just the backrooms, but there are several levels that look very different, some with some really complex design like the infinte bath (?) and overall it's just fun exploring. There is not really much else you can do nor is there a challenge but that's the point. It's also good if you're listening to a podcast.
Exploring the levels for the first time is fun. For the future, I would suggest to add more variety to each level so that you don't figure out the level's pattern completely after a few minutes.
Graphically, it is also well done. The low-res textures look nice and I like this game actually makes use or scaled textures that span over multiple nodes (a feature which many games do not use yet). This is great to make the tiles not look too repetitive. There are still a few graphical bugs (see issue tracker on Codeberg), but it's OK. The teleport effect is a bit too instant for my taste.
The sound ambience is pretty good but could be improved, especially the footstep. Some areas have no ambience which is a little disappointing, but I hope future versions will improve.