i have to check, if the gui has some issues with blanks in the file path.
-> fixed in v0.1.2
pokemon crystal is using a MBC3 mapper
so i guess the emulator isn't working with MBC5 games
if you use pokemon blue, green, yellow or red shouldn't matter at all

00h ROM ONLY 15h MBC4
01h MBC1 16h MBC4+RAM
02h MBC1+RAM 17h MBC4+RAM+BATTERY
03h MBC1+RAM+BATTERY 19h MBC5
05h MBC2 1Ah MBC5+RAM
06h MBC2+BATTERY 1Bh MBC5+RAM+BATTERY
08h ROM+RAM 1Ch MBC5+RUMBLE
09h ROM+RAM+BATTERY 1Dh MBC5+RUMBLE+RAM
0Bh MMM01 1Eh MBC5+RUMBLE+RAM+BATTERY
0Ch MMM01+RAM 20h MBC6
0Dh MMM01+RAM+BATTERY 22h MBC7+SENSOR+RUMBLE+RAM+BATTERY
0Fh MBC3+TIMER+BATTERY
10h MBC3+TIMER+RAM+BATTERY FCh POCKET CAMERA
11h MBC3 FDh BANDAI TAMA5
12h MBC3+RAM FEh HuC3
13h MBC3+RAM+BATTERY FFh HuC1+RAM+BATTERY