“Prototype” is right, but what is there is suggestive of a potentially very exciting game, should it be fully fleshed out.
As of current, the actions which the player can perform are simple: As the dungeon master, you can place 2 types of ghosts, or swap to the dungeoneer; and as the dungeoneer, you can attack or swap to the dungeon master. That’s it! Though no other options exist, I could easily envision this being extended to the dungeon master being able to create complex dungeon setups with the dungeoneer traversing them with equally complex set-ups.
The choice of graphics was excellent. Picking bright, small-sized pixel art—combined with the name—really leans into the “cute” sense, rather than aiming to be something grim. Though, a gameplay perspective, I do wonder about the logistics of having the dungeon master have a first-person view rather than a top-down perspective, perhaps something to investigate.
I’m also slightly confused by the interaction of the dungeon master & dungeoneer. Is it meant to cooperative, where the dungeon master assists the dungeoneer without overwhelming them? Or competitive, where the dungeon master tries to overwhelm the dungeoneer whilst inadvertently assisting them? Either of those options sound interesting, though possibly hard to implement in practice given the fact that really both characters are controlled by the same person as of now. Unlike similar tools, such as Super Mario Maker, I do think that this game may benefit from separation of responsibility of the maker and player as separate individuals.
Perhaps—though very much outside what I imagine your current scope is—you could have some online compatibility, where one player becomes the dungeon master and the other the dungeoneer. Honestly, the potential this prototype extrudes is fantastic, it could be taken in so many unique and fascinating ways, and I’ll be curious if you develop on any of those.