Neat stuff. Unfortunately there's a mouse bug for me in windows 10. It only allows a small rectangle to move the mouse within so I cant reach the right side of the screen, so cant access menus, characters. Mapping keys would be a good work around and a good option.
e.g. escape on main menu = ask to quit to desktop.
1-8 = fight with character?
Loving the retro cyberpunk feel you're building.