From Ren'Py Visual Novel Engine

RPG frame

This is a frame you can use for your RPG project if you intend to create a hybrid project (renpy+minigames).

It might be a good introduction to style editing and game loops notions.

In the init section

init python:
    def stats_frame(name, level, hp, maxhp, **properties):

        ui.frame(xfill=False, yminimum=None, **properties)

        ui.hbox() # (name, "HP", bar) from (level, hp, maxhp)
        ui.vbox() # name from ("HP", bar)

        ui.text(name, size=20)

        ui.hbox() # "HP" from bar
        ui.text("HP", size=20)
        ui.bar(maxhp, hp,
                xmaximum=150,
                left_bar=Frame("rrslider_full.png", 12, 0),
                right_bar=Frame("rrslider_empty.png", 12, 0),
                thumb=None,
                thumb_shadow=None)

        ui.close()
        ui.close()

        ui.vbox() # Level from (hp/maxhp)

        ui.text("Lv. %d" % level, xalign=0.5, size=20)
        ui.text("%d/%d" % (hp, maxhp), xalign=0.5, size=20)

        ui.close()
        ui.close()

In the game script

label start:
    with None
    jump fight

label fight:
    python:
        charmax_HP = 1000
        char_HP = 1000

        tigermax_HP = 2000
        tiger_HP = 2000

        while True:
            while tiger_HP >= 1000:
                tiger_HP = tiger_HP - 10
                stats_frame("Tiger", 4, tiger_HP, tigermax_HP, xalign=0.75, yalign=0.0)
                stats_frame("Hero", 1, 86, 86, xalign=0.0, yalign=0.0)
                renpy.pause(0.05)
            break
    "Tiger" "Gao gao! You're strong!"