This game had so much potential, but the execution is pretty awful.
There is very little interaction between players. You build your own dungeon. The heroes come to town, you figure out which hero goes where, and then it's either "yup, beat him" or "nope, got hurt".
There isn't really that much difference between the rooms, or the heroes. They could have done something really interesting by giving rooms drastically different abilities, and heroes different skills that would tally scores rather than just win/lose the fight.
The game is called Boss Monster, you take on the role of a Boss Monster, so then why is the boss monster essentially irrelevant? Why am I relying entirely on the dungeon to kill the hero? If the hero makes it through the dungeon, I lose the fight? Isn't beating the Boss Monster supposed to be the hardest part of the dungeon?!
I played this game both in two-player and four-player, and was left with the same feeling both times. It felt like we were playing it wrong, like we were missing important details. But after going over the instructions, we were doing everything right.
The game seems to drag on at times, without much really happening, and then all of a sudden, someone wins. There's no sense of victory, because the winner in both games we played just won suddenly, without anyone feeling any anticipation of the game coming to a close.