This is great! I love the look and feel of it. Somehow the screenshots did not do it justice, but once I started playing I felt like the simple graphics were the right approach.
The auto combat is brilliant. Party based combat can feel tedious to me at times, but this was just a great balance.
I like how the map did not repopulate monsters, so you could incrementally get deeper into the dungeon with each visit. And it prevented you from exploiting the lower level monsters beyond a certain point.
I think the only thing I felt might be missing was some kind of indication as to how close the actual goal is. It would be nice to see a simple meter showing how far the dragon was (or whatever) and I think it would have kept me invested longer.