While obviously still very early on, the use of visuals and audio sets the tone quite well for the game. Gameplay starts boring, once I snowball the upgrades it's kinda fun to decimate the enemies and literally run circles around them. I didn't try retreating from a dungeon mid run, but it seems like a weird choice, only worth it if you think the run is doomed. Could use a lot more variety, just walking between arenas felt a bit stale after awhile, it could use some treasure, miniboss, and/or gimmick rooms to spice it up. I beat the boss and lit the candle, but then crashed the game after upgrading my HP. I also agree with everything Kurikaeshi said bellow me.
Looks good so far, looking forward to how the game develops.