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"I think you should add more guidance after that point."
yeah, indeed;

"When you die, collected resources dissapear. "
are you sure that you didnt save after collecting the upgrade?
you can check it in the save file.

go to  AppData/Local/Projeto_definitivo_v2/Save.ini

and check the value of hpmax. if you have the hp upgrade this value will be more than "100.000000". 

I'm sure. I tested it with the power crates, and the same thing happened.

thank you, i'll look into it!