When playing both web and desktop versions I noticed:
1. Real important: when playing with a knight, you get a victory after the first boss! I got the same result with an other class, but don't remember, which one. I still managed to go through the first boss with an archer. With a Knight I guess it was first run after I opened the game. Maybe it can help, that the first boss died from passive attacks (thorn or burn both runs).
2. In the second boss battle boss doesn't use all attacks it gained, only four. Also it started missing with healing card. Don't know if it's intentional or because it thinks that it have used all its dice.
3. Music still continues after death.
4. After using a Thorn potion there is again number 0 on the players card.