I found out what has been crashing your game. I'm a bit of a expert of adding custom characters cause I am getting them all working and I found out what you did wrong. Go into custom chars and go into you 8bit character folder now you see the character .png and .xml rename those both to char.png and char.xml and I will work! I hope I helped. and if you want you can put me in the credits for the help if you want no biggie.