Thanks. The reason you start over when you die is because the game is very easy if you start from the same place.
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Of cause tuning the difficulty is up to you.
Just to describe my experience I have to admit that it was too hard for me to finish.
I got to the 5th (can't remember exactly, the second one where you had to unlock the crystal before collecting) stage three or four times and then gave up because I didn't want to always start again from the beginning just to get better at the later level.