I really liked how you added multiple interpretations of the theme (connecting rooms, and the main weapon). It took me a second to figure out that the "bullet edge" damaged baddies, maybe some hitstun or effect would help clarify that.
It would be cool to see the dungeon building expanded to force me to make tactical and tough decisions (maybe only rooms with monsters have chests, limited doors, health rooms are out of the way but locked into a locations, etc).
Also the whole presentation is super polished! Super well done!