Thanks for the feedback! We totally understand the sentiment. The card game was added to have gameplay that can be used to solve conflicts inside the dungeon, so I guess it is better suited for the ones where characters started the battles. (In both cases losing the card game is a valid option.)
To be honest the battles inside the secret passages being random encounters isn't that far off - in the end, Mops & Mobs is in part a parody of the Fantasy RPG genre. Of course we don't want to have jokes overstaying their welcome, so I don't think we will have situations like this that much anyway. (And right now, everything is still WIP, so things might change.)