The game was just a falloff actually.
I was looking today for one of my old games to use for this
Highscore. Trying to lean php right now.

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A more advanced way would be to let the player first create
an online "player Account". (a simple one directly in the game,
without email or such)

Then I could directly clean out wrong inputs.

The submitted data can also be analysed with a more
advanced key.
For example by submitting a key to the account at startup,
then using this key to generate a checkkey.

I did not test if the HTTP plugin runs in Lite-C.
Where it is saver to implement.