Ok, I have to say, this game ended up being a lot more amazing than I expected...
There's more flexibility than I expected in terms of what you can do and how you can do it, and while scene collection can take a while, the gameplay is interesting enough to keep your attention through it.
About the only thing I didn't like are goblin veterans... depending on my luck and upgrades, those shits can take foreeeeeeever to kill because I have to be careful to ensure that I don't push them high enough to break my shields...
Still, right now, I'm only missing one image from one event on the 3rd floor... and I didn't even touch hard-mode.
I find it hilarious that the game tells you that you can't beat the Demon Lord on Normal, but I was certainly able to pull it off, and without the Mistress spell either. Insanely hard and insanely lucky though...