I'm experiencing some odd issues with this core related to left and right movements and saving joypad settings.
It seems the joypad settings are lost each time the core is started and sometimes left and right movement either by keyboard or joystick is buggy and doesn't work.
Sometimes I'm lucky and restarting the core and redefining the joystick works including the keyboard inputs for movement.
I also noticed while playing the game if I press the OSD button it toggles autofire when no other buttons are pressed. I don't think this should happen.
Besides that, I'm really enjoying the MiSTer Crazy Climber core.