This patch fixes a small collision in the input mappings for keyboard that caused incorrect movement for players using the default keyboard controls.

New players will have the corrected control mappings by default, but existing players should do the following:

1. Launch the game, and choose 'Commodore 64 version'
   
2. Pause the game (e.g. by pressing 'Esc') and choose 'Remap controls', then 'Remap Keyboard'
   
3. Scroll down until you have highlighted the entry for 'Virtual Up/Down Key'
   
4. Press 'Clear mapping' to remove the mapping (Del by default)
   
5. Repeat for the 'Virtual Left/Right Key' entry

This should fix the issue.