Thanks to Bery for the source code, and for this great game written originally to Videoton TV Computer, now it has been ported to CPC, and thanks to Csabo, 
who wrote 2 cool musics for Commodore +4, and allowed to use it for Enterprise also, so it has been converted, and added :)
There are some other changes also:
- Ingame Alien voice samples have been removed.
- Red lights are flashing now.
- If the game was completed, it increase the speed of the player, and the aliens also, and the aliens become even faster than the player, after the 3rd completion
  the speed resets to the original
- Exit arrows colour are fading.

Controls:
- player control: QAOP+Space/Joy1/Joy2
- F1: turn on/off the music
- ESC: resets the player/alien speed (available in title screen only)