Activate cheat mode. With cheat mode on, use the following cheats.

Code - Effect

simeon - Cheat mode
D - Dutch
E - English
F - French
G - German
[Left Amiga] - Invincibility, unlimited keys
[TAB] - Level Skip
[F1] - Power Sword
H - Slow Motion
[F10] - Toggle Pal or NTSC display