I've only played for about 30mins, and I already love it! I've never been so impressed by even just an options menu! The attention to detail and reactivity in all the games menus are, dare I say... Juicy?
My biggest complaint is that I wish there were a little less monsters, or there were safe rooms where I can take a little break. As it is the constant onslaught of weak enemies swarming me just makes the game tiring to play. And so even though I enjoy the game I can't see myself playing for more than 30mins a day.
Maybe you break the map up into regions and after you kill a certain number of enemies they stop spawning in that region(Or maybe that's already the case and I just didn't notice), or you make the monster's AI less proactive and only attack if you approach them?