With Proton 7.0-3 I had a more stable experience, which was good enough to play through the game, but far from perfect.
Instability:
Occasionally
Despite Proton 7.0-3 being much more stable, it still resulted in the occasional crash.
Significant Bugs:
Upon completing the final mission, right when the ending movie is supposed to play, the game freezes. This happened to me twice, so I ended up having to watch the ending on Youtube.
At the advise of a report below, I compiled Proton 7.0-3 myself and had a better experience with it. The game remains somewhat unstable though, and I wasn't able to view the ending. Also, the game has a little launcher that's somewhat annoying to deal with.
Proton 7.0.6 - Launcher opens, click play and a small progress bar appears, launcher appears again.
Ja tedy nevim, ale hrani si predstavuji jinak nez ladit ktera verze protonu bude fungovat s nejakou hrou.
Zkusím přeložit pointu komentáře: asi bych běžnému uživateli Linuxu nedoporučoval hru (ať už zdarma nebo za peníze), která je silně nestabilní, s aktuálními verzemi emulátorů nefunguje a vůbec tím pádem stojí na Linux za prd. Kdyby se zprávička uveřejnila na portálu vývojářů Protonu, že můžou ve svém volném čase pilovat hratelnost hry, asi by to smysl dávalo...