Besides the anti-cheat, the game runs perfectly well under proton. As soon as support is added, the game should be good to go. The developers posted this on steam:

"With regards to supporting Linux/Proton, we'd love to support more platforms in the future, but we're a small team, so we need to consider how it would affect our ability to expand our anti-cheat efforts before making a decision. We'll be keeping an eye on how everything is working through playtests and as we head to launch."