Really Simple D20 Rules for young kids

For the last few months my little girl has been playing with my figures and dice. We have a PA day coming up and I want to play some story games with her. Here is a simple version I came up with for us to use, to get her involved in the game, and have her roll some dice.

Things you need: 3 sets of dice, minis and mapping tools.

Rules:
Have all players get two minis and characters.  They come into the area and look for things and avoid monsters.

Have a separate dice for every mini to keep track of health. When hit, change the number showing. When they are reduced to zero, the character runs away.

Character Types:
Strong Girl - 2 Good skills, Use a 10 for health
Fast Girl - 4 Good skills, Use an 8 for health
Smart Girl- 2 Good skills, Use an 8 for health

Move
Roll d6, move that many spaces.
Roll 4 or higher, move and attack at same time

Attack: Must be next to a BG
d20 - 1-5 miss
d20-  6-12 hits, roll avoid
d13- Cannot avoid
If the attacker rolls 13 or higher, they hit doing 1 pip
If the attacker rolls 16 or higher, they hit doing 2 pips
If the attacker rolls 20, they hit doing 3 pips (strong guy only)

Avoid
Roll 6+d6 - if you roll higher than attack, you avoid
(Use 12 +d6 in later games, but otherwise the same)

Skills : Use D8 for good skills, D6 for everything else
Hide=Monsters can`t find you
Find=You can find things
Run = Run away or double Move
Jump = Half the number is how high you jump
Swim = Swim or stay in same spot
Climb= beat target and you climb to where you need
Grunt=any kind of lifting or moving things

Target to beat: easy (3), rough (5) or hard (8)
(We only use Hard level target for later games)

Spells (have 3 at a time, cast any number of times) - Smart Girl only
Bubble: Surrounds someone, they don`t take damage, and can fall or swim safely
Boom-Loud Noise, scare BG for d6 rounds
Back-Push= BG gets pushed back d6
Bop - hit someone for 1 pip from 3 spaces or less away
Beg - you've asked a favor, to avoid, defender must roll 11 or 12 on 6+d6
Help - friend gains back 2 pips

Loot: Set the target at a ertain amount of loot to find. Every time they are at a chest, door, table, etc the character can try a find check, if they beat the target they receive 1d4 bags of loot. The game ends when the good team or the bad team finds the required amount of loot, usually a loot target of 10.

Bad Guys (BG) are Monsters always have D6. They always do one pip of damage. Have no skills or spells. They are looking for the same stuff you are. They scream and cry a lot.