Hello. You can rebind keys with F1. As for the visual bug, this is the first report I have heard of this.
Viewing post in Heavy Hearts [18+] Adult RPG comments
soo, apparently, this issue is prevalent in another game i played as well. for that game specifically, it only happens to the characters in the party, whenever a battle starts, all i can see is black boxes of texture covering each character, the enemies are alright tho, maybe one of the plugins is at fault, or smth else.- in any case, i have no idea.