I had a problem loading it during the playtest (black screen, forever loading icon) and had to install Proton EasyAntiCheat Runtime for it to start up properly. Never had a problem launching the playtest or full game after that!

not sure what method you tried, but I was able to get V2 running via Lutris using the guide in this repo

I was able to get the V2 suite working via Lutris, haven’t tried this new version though. Seems to be possible as documented here

Svelte has been gaining popularity for a number of years and is one of the best alternative frameworks IMO