I just got around to trying this. Let me just go over my experience so you can understand why I'm probably not going to play this again. The opening narration was fine, but once out in the mine, the only indication I saw of an objective was the chest. I decided to follow the railroad after seeing that the nearby sign had no point to it, and that got me into battle with the first slime.
There were 4 of them. I didn't get the tutorial message about weaknesses until after I'd split one, at which point I found out that they deal less damage that way. That meant that the information I had available was that I might be able to kill them faster if I tested for their weakness, but my best hope of minimizing damage in this 1v4 fight was to split all of them. Put another way, the best strat that I knew was definitely available for the very first fight in the game was to make the fight take a really long time. I also still lost 2/3 of the maximum hp in the process for only a small portion of exp.
After that I continued down the railroad and tried to avoid the next slime, only for Shiori's inner monologue to hit and prevent any movement. At that point I then found the slime's ice weakness, but I was still annoyed at having to fight it at all.
From there I thought maybe I should check a side route for chests, and then got caught by a rat that I literally couldn't see due to the lack of color contrast. I decided to use lightning because rats and slimes are very different, but the rat turned into a basty, then cast sleep with no message indicating how sleep works nor any indication of which monster's weakness would have applied during that attack.
From there, I tried the two spells on it and found that neither were its weakness, before the other 3 rats got enough crits for a game over. Since it hadn't occurred to me that saving would be needed that early, I started a new game. I then found out that the opening dialogue has very frequent hard pauses that prevent skipping it. That's the point where I stop playing.