I loved this! It felt really good to place the monsters and watch stuff unfold. I almost wanted it to play a bit like boss monster, a card game where you're trying to stop heroes from proceeding through a dungeon instead. It took me a while playing to understand the goal of this game wasn't to stop the heroes but to get them through.
Anyway, this looks and feels excellent and I think has a lot of potential! My only complaint is that your link to the theme feels tenuous at best to the point where it almost seems totally unrelated to me. But loved playing the game, great work for only three days!