Game works with Proton version 5.13-6 and you proceed into game after the introductory help messages. So this would be a regression of some kind in 6.x and 7.x versions of Proton (including current experimental).
Game looks to be using nwjs.
Before the backtrace is another error which may be leading to the later problem:
[0927/132913.158:ERROR:http_transport_win.cc(175)] WinHttpCrackUrl: error 0x13d while retrieving error 0x2ee6 [520:568:0927/132913.159:ERROR:broker_win.cc(134)] Error sending sync broker message: Putki suljettu. (0xE8)
So (named) pipe was closed for some reason causing the later part? (I don't know why it messed language of the error message there.) That might trigger some fallback action which then leads to exception being raised.
Nothing extracted yet.
Compatibility Report
System Information
I confirm:
Symptoms
Game exits after pressing "new game". Log has backtrace pointing towards v8:
v8::internal::compilerReproduction
steam-1071220.log.gz