Hello @derram, please copy your system information from steam (Steam -> Help -> System Information) and put it in a gist, then include a link to the gist in this issue report.
@kisak-valve here ya go: https://gist.github.com/derram/50bf1eb3e50a426b63505366e2a45def
Basically the game uses node-webkit. However chromium/webkit uses some api hooking that's hard to implement in wine. There are some staging patches address this.
A blank node-webkit window is now launched instead of the game in 6.3-5 and experimental.

Progress of a sort, the window is no longer blank in the most recent proton experimental.

7.0-2 (beta) now launches a black game window that displays the steam community and controller config notifications, bu still no game. Title of the window is "Uncaught node,js Error"

Found a workaround on the steam forums. Not something that can be officially implemented, but since this game will prolly never see proton support it's nice to have it working.
https://steamcommunity.com/app/262790/discussions/0/3112542578514926583/ (https://archive.ph/1xsuY)

Working on both desktop and deck.
8.0 now launches the game with a correctly named blank window, but the window closes after only a second.
proton experimentalx1 2021-11