Level Codes:

Level  2: LEVEL2    13: BULLIT    24: KLOWWN    35: ELTRIC

Level  3: VISUAL    14: QRAZZY    25: INDIGO    36: 187293

Level  4: COWBOY    15: 16F6FR    26: LINGLE    37: GROOVY

Level  5: URGENT    16: UNLINK    27: LOOGER    38: DOUBLE

Level  6: OOPSUP    17: PIXXEL    28: INSIDE    39: ROLLER

Level  7: TOPTEN    18: EUROPE    29: SP25PS    40: CLOSET

Level  8: D14DH7    19: NEWTON    30: KNIGHT    41: SLOWLY

Level  9: ASDFGH    20: FREEZE    31: HINOON    42: BISNIZ

Level 10: SOLONG    21: LAUNCH    32: NOBODY    43: 124816

Level 11: SURFIN    22: M7MS49    33: GOODIE    44: TARGET

Level 12: RACKET    23: GALWAN    34: QQZAYB    45: ANZING

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Source: Amiga Future GTT

Cheat Keys:
CTRL + B - Stop/reverse background scrolling
SHIFT + SHIFT + T - Freeze timer
ALT + ALT + H - All hearts count as collected
AMIGA + AMIGA + S - Skip to next level

Additional Level Codes (46-50):
Level 46: VOHDOH
Level 47: Z97531
Level 48: WOODYS
Level 49: Y2X3W5
Level 50: XUQZOX

Freezer:
Hearts left: $75F47