friction = твое_значение

cur_hp = 100; //начальное кол-во хп
cur_hp += cur_hp*(lvl/максимальный_уровень_прокачки);
max_hp = cur_hp; //задаем макс. кол-во хп

am_bottle = 0;

max_hp = cur_hp+am_bottle;

y -= (place_free(x, y-5)*keyboard_check(ord('W')))*5;
y += (place_free(x, y+5)*keyboard_check(ord('S')))*5;
x -= (place_free(x-5, y)*keyboard_check(ord('A')))*5;
x += (place_free(x+5, y)*keyboard_check(ord('D')))*5;