Technically Luanti isn't a Linux-exclusive game, but it is open-source and I am running it on Linux natively (EndeavourOS, which is based on Arch!)

I have tried out Asuna and Mineclonia, two of the most popular survival games on Luanti. The screenshots are all from Asuna, as that was the one I enjoyed playing the most. Mineclonia is trying its best to replicate Minecraft, meaning you become more critical of things that are a bit different (a little like how people often complain more about Windows clone Linux distros vs ones that are doing their own thing), but I think Asuna was a more enjoyable experience because there were a lot of improvements to the gameplay over Minecraft.

For example, the 3x3 crafting grid is in your inventory in Asuna, so you don't need to bring crafting tables everywhere! There's also a built-in recipe list, and it's actually super useful as you can also see the recipes a certain item is used in when you double click, so if you selected cobblestone, it would show you the pickaxe recipe, stairs recipe, etc. Sprinting in Asuna is very speedy too, apparently it's a 100% speed increase, which is kind of insane, but it does deplete your hunger very quickly. One more thing about the UI, I also like that the tooltips of the items show you their properties (like bounciness or durability). I'm a bit puzzled by the "research" tab though, it seems to eat an item and tells me the item group (which seems like useless information unless I'm missing something? There's also a level indicator which gains xp if you feed multiple of the same item, not sure what that's about)

There's also more mobs, more blocks (especially the decorative kind, there was a lot more variants on the different types of stone for example), and lots more biomes as well. It feels like some sort of modded Minecraft where you have a bunch of new bits to explore again, and the terrain generation is more interesting as well! In my little base, I used "chrysoprase", which is a green stone, and it's a bit like deepslate or blackstone in Minecraft where you can use it in place of cobblestone in recipes, and you can make walls, bricks, etc. In fact, all the stone variants (of which there were many, including different coloured granites, the bright green chrysoprase, dark green jade, and probably lots more others I haven't discovered) can be used like this, while in Minecraft that isn't the case.

There are even plenty of new animals, in particular I love that birds spawn flying in the sky! The main hostile mobs I encountered were slimes, and there were many variants with different properties. For example, aquatic slimes have a slight glow, while poison slimes leave damaging goo on the floor. It's a bit like that colourful slime mod for Minecraft where you can get all sorts of colours of slime for your builds! I also noticed that some of the slimes stole my items, and that they drop them once I kill them (accompanied by a delightful squish animation), which is also new!

It's pretty cool how you can install mods super easily in Luanti, though Asuna already includes a lot of the mods by default. I also like that it's super easy to set up multiplayer, it's just a checkbox to host a temporary server (and I believe you can set up an always-on server as well)

There are some "missing" bits though. My main gripe is that there is no swimming in Asuna by default, making crossing water quite difficult. There is a mod that adds swimming animations, but they don't increase speed and are quite buggy as well. Additionally, there are some bugs, as chickens have repeatedly disappeared in front of me. No idea why, and it's only once I have them safe in my pen! The pathfinding of the animals is also not as good, the chickens can't go around the open fence gate door when following the seeds. You also won't get compatibility with all the existing Minecraft worlds, mods, and shaders, but that's to be expected. I play with shaders in Minecraft sometimes so that is something I miss. There is native controller support in Luanti as well, and in Java edition Minecraft, that requires a mod like Controlify!

I don't have much else to complain about though, it's simply really fun to try something new and fresh once in a while. If you have any questions, let me know!

p.s. does anyone know what the "research" thing does in Asuna? There's not much documentation on the game online (another upside for Minecraft, there is a VAST swath of information online about every little feature)