There is literally a guy posted a 1.0.6 patch file 1 hour before you sent this comment
just tried it and unfortunatly it doesn't fix the issue with the one unplayable girl (the heart one in the 5th area). haven't tested the image related errors yet, but the changelog doesn't mention that either. i'd assume our issues are more with the MTL messing things up than the game itself (?).
here the google translated changelog for convinience:
ver1.06
- Set a lower limit for maximum HP (100)
-Fixed an issue where cards of other characters would appear for certain characters.
- Corrected the behavior when there are no cards in the deck or only unfavorable cards (changed to skip if there are no cards, and select unfavorable cards if there are only unfavorable cards)
-Fixed a bug where an error would occur when returning after hiding the UI with Tab.
-Fixed an issue where options were not working properly for some enemies.
・Fixed a bug where skill names were not displayed correctly in multiple battles.
-Fixed an issue where some enemies would not start with their HP at maximum