Rio das Ostras
Rio de Janeiro
I am thinking like you. From the whole rulebook, a solo variant could be done without a lot of problems and still keep the flavour of the multi player game.
One thing that should be well thought is about how to put some stress to the player via the presence of the monsters. Something like a direct attack to the player's life point (like in Magic the Gathering).
To shorten the game if it's "long", I read in a post to simply reduce the monster deck.
About the playmat, if some BGGeeks have the artistic fibre to create such component, I sign now!!!!
It's a fun little game with way cool arts, and it's cheap. So, why not??
Yeah, and there will be an expansion soon... Maybe they can add some solo rules with some cool monsters.
Maybe we can add some hp and if heroes aren't enough to absorve it, you lose that many hp. It might work.