Move with arrow keys. Z to zap. Spacebar to drink potions (restore health).
Look for 4 keys, color coded to open 4 doors. Gather 6 ingredients and boil them in your cauldron before you try to fight the Pumpkin King.
HexenKrone is inspired by the classic game Cauldron which was popular on C64 and other platforms in the 1980s.
You should find HexenKrone much easier; there is no platform jumping and you can safely land/launch in most places. There are items and powerups also.