For infinite lives, play the tape from the start.
This hack remains untested, since I do not have a tzx cassette image of the original game.
Click here to download this hack (TAP format) or Click here to download this hack (TZX format).
10 FOR f=23296 TO 23329
20 READ a : POKE f,a : NEXT f
30 RANDOMIZE USR 23296
40 DATA 221,33,203,91,17
50 DATA 46,1,62,255,55
60 DATA 205,86,5,48,241
70 DATA 33,27,91,34,129
80 DATA 93,1,8,93,195
90 DATA 8,93,175,50,252
100 DATA 169,195,0,143