This is really good. Peak roguelike. It's very easy to get the hang of but very hard to win. It's the good kind of hard, where I can tell that every death is definitely my fault. The pathfinding algorithm is really good-- when you click on a tile and your character automatically walks there, you never get stuck or walk into traps or anything, and it stops auto-walking when an enemy appears. If that algorithm wasn't good, I would hate playing a roguelike controlled primarily by the mouse. I also like that you can click on a tile on the minimap and auto-walk there.
(SPOILERS) Because you're leveling up and learning skills and stuff, it feels like there should be a boss or something at the end, so clicking on the goblet (which is just sitting on the floor) and getting a popup where your only option is to click "DONE" is pretty anticlimactic. It would be cool if there was at least some fireworks or something... since it took me like 100 tries before I ever won...