Level select:
Load or reset the game, then execute the following BASIC commands before running or restarting the program. Note: X represents the desired starting level, from 1 to 10. 

POKE 18842,X
SYS 18432 
Set number of lives:
Load or reset the game, then execute the following BASIC commands before running or restarting the program. Note: X represents the desired number of lives, from 1 to 255. 

POKE 18863,X
SYS 18432