- fixed roll-over bug for energy when you score 10.000 points
- higher speed in the level end sequence and bonus counting
- faster sprite drawing
- FIRE button to start in addition the the START button
- Adapted title screen (flashing, positioning)
- XEX format and a load address of $4000, so it can be loaded from any regular Atari DOS
- a 4 digit energy counter and display
- a fix zero page corruption bug that was present in the original game when placing red saucers on the very bottom of the screen
- support for ESC key to quit the game in addition to the INVERSE key