The mockup of the front is hideous, I know, but I'm a total amateur at these kinds of things.
On a word document, the rules text on the back is all caps, bold "aptos (Body)", 7 font, single spacing. It fits into a 2" wide, 3" tall space. the first word of each break is umber color. Anyways, here's the iteration.
CHARACTER. WRITE A NAME AND MAXIM. FILL 2 STAT BOXES, A SKILL BOX, AND 3 HP BOXES. INTRODUCE AND DESCRIBE YOURSELF.
GAMEPLAY. A GM FACILITATES AN ADVENTURE. IF AN OUTCOME IS UNCERTAIN, THE GM PICKS A STAT. FLIP A COIN, PLUS 1 MORE FOR EACH FILLED BOX OF THAT STAT, PLUS 1 MORE IF SKILLED AT IT. IF YOU WIN A FLIP, YOU SUCCEED UNLESS OPPOSED. IF OPPOSED, WINNER OF THE MOST FLIPS SUCCEEDS.
DAMAGE. MINOR =1; MODERATE =2; MAJOR =3; MORTAL =DEATH. AT 0HP, FLIP A COIN. IF YOU WIN, YOU PASS OUT. IF NOT, YOU DIE.
HEALING. ONCE A DAY, AFTER 6 HOURS OF SLEEP, FLIP A COIN. IF YOU WIN, HEAL 1HP.
EXPERIENCE. FILL AN XP BOX IF YOU FAIL AN ACTION, MAKE A HARD CHOICE BASED ON YOUR MAXIM, OR SURVIVE AN ADVENTURE. YOU CAN SPEND XP: 3 =A FAILED ACTION HAS MIXED RESULTS; 5 =FLIP A COIN; 7 =FILL A BOX.
Quibble. In your original front, there's a heart for hp and a heart for charm, which sends a mixed message at first glance. It's kind of a cognitive misdirection.