Completed save can be found at speedrun.com/leo_the_lion/resources. Download status.leo file, unpack and paste at game directory\cloud_saves. Backup your old STATUS.LEO just in case.
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Here are the cheats. They might spoil the fun, so take care when using them.

XXDOC - immortality
XXSCORPIK - immortality
XXKATE4EVER - predator cloak
XXLEON - gain energy
XXTOMEK - extra life
XXZIBI - life minus
XXLESTER - crashes
IDDQD - crashes
XXTEPE - change directions
XXDLUGI - death
XXCYBERIUS - gain all items
XXJACK - flying (Kadmar 1 only)
LEOTEAM - team presentation