I’m afraid I haven’t actually tested it with Proton or Wine, so I can’t guarantee compatibility. That said, it’s just a basic Unity Windows build, and it’s not very demanding in terms of performance, so I would be surprised if there were any major issues there.
Sure thing! I'm open to adding a native Linux version for the game at some point in the future; I haven't prioritized it thus far because I wasn't sure how much interest there would be in that, but it's certainly not something I'd rule out.