HTML version is broken and buggy. After you play the three cards you have in your hand you can't do anything else other then end turn as no more cards get added to your hand ever.
I'm using edge. Each time I played a card no new card was ever added to the hand and once all three original cards were played all I could do is hit end turn till I died. When I play a card a new card appears for a split second and then never gets added to the players hand. I did happen to beat the first enemy by getting 2 swords at game start.