Unlimited lives:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 24853,173 
Unlimited time:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 25299,173 
Glitch: Frozen enemies:
When there are enemies on the screen, walk up against the wall above you. Wait until they are up against the wall as well, then jump. They will be stuck in place, and you can approach them and beat them down at your leisure. However, you will have to learn how close you can get to hit them without them hitting back. If you move downward they will become unfrozen and move again.