Out of many "you're the dungeon boss" games, this has some nice and unique ideas! I like how the goal is still for the hero to go on, and the DM needs to self-sabotage (much like in tabletop RPGs).
I think the game could improve by introducing more interactions between the monsters, and maybe forcing the player to interact more with environmental hazards. Maybe a treasure of some kind if you lure the hero to a dangerous path, so we'll need to balance our options.
Overall, really liked it!