Great game. :( This run however I beat the second boss and during the third after I won after a hard battle it got stuck. 
not even concede works
EDIT: holy it even broke my safegame on restart no class selection works
144 days ago (+1)
I deleted my savegame restarted this time it got stuck in the selection screen and I could add infinite upgrade
EDIT: and another savegame broken thats it for me
144 days ago(+2)
oh man, that's unlucky. First time I hear about this issue
Clearing the site data in the application section of the console didn't help?
144 days ago(+1)
Sorry to hear that, but thanks for giving it a go. We will try our best to locate and fix those issues
You can see in the screenshot that the shaman cast a spell I think the first time right during victory. The second time happened during dice upgrade selection. I spam clicked there then I could pick infinite upgrades but the entire game including savegame were corrupted and did nothing (except for char selection, not starting a game, not buying upgrades)