I found this

http://www.gamefaqs.com/pc/564981-relentless-twinsens-adventure/cheats

but it doesn't work

I keep dying and dying in the first section,when I must kill the guard with the ball.
After two deaths,game over.And I must restart from the beginning,when you leave on the track :(

You'd probably find an infinite health cheat more trouble than good. There are many situations in the game where you get stuck in a "hit loop" and just have to wait till you die (a long wait with infinite health).

The game makes a poor decision at the start in not letting you have any respawn points inside the prison (and has very few on citadel island), however once you get into it then you usually respawn quite near where you died (even when it says game over, you just load your game again and you respawn).

Incidentally, I can't recall any part in the prison where you had to kill a guard with you magic ball, I used aggressive mode to kill all the guards I was supposed to. The ball is very hard to aim, and is only really needed against enemies with fast firing ranged weapons. Where possible just kick 'em.

There's an LBA Trainer - https://forum.magicball.net/showthread.php?p=458695#post458695

Check the attached screenshots to see :)