Many game devs on here have a very bad track record with linux support so I would like to know if these guys actually give the faintest fraction of a fuck about linux users. Am I going to have a headache with this and just install it with wine or get pissed off and refund it out of principle? Please let me know so I don't waste even more of my time.

I played the game on Ubuntu about a year ago and had zero technical problems that I recall. Installed fine natively, played fine, I don't remember any crashes. I didn't quite finish the game but got maybe 80% or so done on the main storyline, and definitely visited all major towns and did many quests and trading trips.

Note that they also have the game's prologue available as a free demo, so you can always download that and see how it works on your computer.

Also for me the last time I played Vagrus is some time ago, but it was okay. You need to be a bit patient with loading (at some times, I had to wait 5 min until the game was ready. But time was shortened by an update lateron).
If you're sensitive about crashes, check the PC requirements and add a bit to ensure a good experience.

I'm playing on Fedora KDE 39. Only issue is a delay in tooltop pop-ups in battle and and framerate drops after a few hours of playing.