When a character dies, they add stats to their overall stat pool. This can be seen by the changing number in parentheses. Initially, all global stats are equal to 10. If you gain 3 points of Strength, the maximum you can gain is 13 Strength if you set the slider to maximum. It would probably be more obvious if I added more points.
In the character creation menu, the left button decreases points, the right button increases them, and the center button moves to the next line. Something like that. Yes, I tried to stick to the original three-button concept.
Thank you for playing!