I was playing normal mode at first, but I highly recommend everyone play casual mode unless you want to go for a high score or something.
It's not a good rougelike game. The random generation sucks and you struggle to even get past each zone. It's very luck based and when a monster or item is in the wrong place, it's basically ended, if not seriously hindered the run. I'm curious if the zones have multiple solutions instead of what I think requires a more like a step by step perfect solution.
The puzzle aspect is interesting, but falls short. You can't solve a puzzle you know nothing about. Even if you know the locations of the doors on the floor you're on, being conservative doesn't pay off as well as you hope. I ended up using all available keys and was trapped without even knowing. I was expecting some kind of message or a random merchant to make a deal with me.
It does pay off to save your money for later shrines, but I didn't know whether to get attack or defense boosts. I mainly focused on defense as once it's higher that an opponent's attack, you're immune to damage, but I bet attack is just as important. The data on monsters isn't useful at all. It would be better to just tell us the damage dealt and the damage taken.