Difficulty is such a tricky thing to juggle. Everyone perceives it differently and everyone plays their own way. Its not easy finding a reasonable middle ground that works for most.
MKRU
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It’s through a quest that you get during chapter 3. Here is a link to a walkthrough: https://docs.google.com/document/d/1VbSILz60_Yc7NyU-DRv3mrX0FVua3WSBD9nlN0Bf5jk/edit
Here is a link to the game's walkthrough. It should help you out if you ever get stuck.
https://docs.google.com/document/d/1RCKQOJiUVQW5iftBNUX7jkSqGXVr5QGC/edit?usp=sh...
There are certain areas of the game where save access is disabled. It's possible you exited an area somewhere and it didn't restore the functionality. A quick to restore it should me by entering Mor Town (vampire route) and then exiting. As for the gallery error, the only one I am aware of is that bug report occurring when the mouse scroll is used on that screen. Also be sure that you are either using the saves you are using are either the pre-made ones (provided on the itch.io download page) or a fresh save file. Hope that helps.