Real fun to play from the get go.
I like that you are thrown straight into the action, and i think you've had a good idea to do this sort of arena based combat each room as it fits well with the theme on top of the limited range area you put for the same intent.
The sprites look good and there's nice variety when it comes to the enemies, the lighting effects really add a lot to the mood of the game in general.
The music is nice but just feel the loop is a bit short so it can feel repetitive after a while.
Difficulty wise it can get a bit hectic when you come into a crowded room with lots of the snake and skeleton enemy types, but that said the challenge still feels fair especially since you can collect some hp upgrades to help out, however i wish there was a bit more to find when exploring the dungeon, with also maybe a bit more background variety to convey a bit more progression, like even a simple color change when you climb up a floor.
But these issues are really nothing much to be honest, the game has a good base already in place, is fun to play, and small details like the minimap are really nice to have here already.
Good job to you guys :)