Returning to Linux after some time, I had a bit of a hassle getting Sparking! Zero running and found that it works without any tinkering under Arch (EndeavourOS in my case).

Singleplayer all works great. There was some slight framedrops upon first hitting the main menu but everything sped up to normal speed after about 10 seconds.

From a quick glance at the leaderboard which had a #1 ranked player with only ~200 wins (odd for such a popular game) and the lack of lobbies, I'm wondering if Linux players are only able to find other Linux players which some reports seem to hint at that but nothing is outright confirmed it seems. Interestingly, all of the matchmaking functionally does work such as the entire lobby system and leaderboards. Perhaps there is some check that executes at the very start of a match that can be resolved one day.

Personally, I only intend to play solo so the lack of multiplayer is no trouble for me.

For those using Ubuntu-based distros and Fedora-based distros, I tried a bunch of different variants and they all gave me trouble with launching. The game would instantly exit, not even rendering a window although it would seemingly all boot up fine with PROTON_USE_WINED3D=1 being required to get the game to launch. This seems to be quite hit or miss depending on your setup though as I can't find any obvious patterns from the various reports in ProtonDB.