So, I've been playing this for a little while now. It's been pretty enjoyable, but I've run into a serious bug with the save system that has halted my forward progress...
I'd been noticing that the amount of time it took to save my game was getting longer and longer as I got deeper in the dungeon. The most recent one I measured took 19.5 seconds. This was a bit of an annoyance on its own, but workable. However, once I get to level 12 (I had just entered, then did a bunch of backtracking to pick up some things I left behind), I started running into an issue where saving the game didn't seem to complete properly, and left me in an unplayable state. Autosaves when going up or down a level would say they completed, but then the party would still be standing in the same place, and unable to move. Manual saves would also say they completed, but the save window wouldn't actually close. I was able to close it manually and keep playing in this case. This was happening intermittently; maybe once every 4 saves or so.
Worse yet, I discovered that loading any of these saves that didn't appear to complete normally would cause entire floors of the dungeon to be reset. When I left the floor where I'd created the save, all of the equipment I had gathered and monsters that I'd already killed were back, doors were in their initial state, etc.
I'm doing a let's play, and I caught the problem happening on video. It starts here at 28:43, and continues pretty much to the end (you can see the stairs autosave failing at 34:15):
https://youtube.com/watch?v=NFq9SiIhrkEI'm playing on Windows 7. I can provide more detailed specifications if it might help. I looked around on disk to try to find where saves are stored, but didn't have any luck finding them... If you can point me to the right location, I'd be happy to send you my save file.
Hope this helps!