Hello Primax,
thanks for asking. Does it not start for you at all? I tested it with Winuae (Kickstart 3.1 with Amiga 1200 configuration). It ist Autobooting (I have not tested if it also works from hard drive).
First comes the "Icefighters Logo with Tiger". Then the "Thorin Art" Image.
When the "Thorin Art" image appears, you have to press fire button, then you start in level 3. Please write to me if it works for you. Best regards