I liked the uniqueness of this game. It has a mysterious atmosphere, which is amplified by the music and gameplay. As others said, it fits the theme perfectly.
When you first open the game, you see the store screen with 0 gold in wallet. Instead of giving a torch to the player at start, it might be better to give 200 gold and let player buy a torch, in my opinion. Unfortunately the game doesn't have any tutorial, but the mechanics of the game are very simple to understand. I selected the medium dungeon in my first round, however I would recommend starting with the easy dungeon. The game is challenging. I don't think this is a bad thing necessarily, it's just uninviting for new players. I didn't notice the counter for a while in my first game. Each round takes about a minute. I think this is short, it would be great as a mobile game though.
The graphics remind me of the old strategy games. Assets look harmonious with each other and immerse you into the game world. Gold chest looks too foreshortened in an isometric world, but the rest of the elements on the map are drawn perfectly. Gold shining effect is a nice touch. I don't like nitpicking but as a constructive criticism, sometimes the player overlaps the south-west wall. If I recall correctly, you need to change the Tile Origin setting in the TileMap object.
Music fits the theme and the game perfectly, and contributes to the feel of the game. However, I would appreciate more in-game sound effects. There is a basic sound effect that plays as you hover the buttons, and even that adds to the experience.
Controls are decent, you can play the game with mouse only. It would be better if you could use keyboard to move. Considering the time limitation of the rounds, I think it would help players and make the game more enjoyable.
Overall this is a great game especially for a game jam. I tried to provide constructive feedback and I hope you find my review useful. Lastly, there is a key in the store and I haven't figured out what it does. This is a great idea as it adds more mystery to the game. Maybe I will try to find out when I have time.