Beat difficulty by less than 5, partial success (in combat, hit for 1/2 damage). Beat by 5-9, success (full damage). Beat by 10+, success plus one Bonus per extra 5. Base difficulty for most tasks is 10, so the typical person can get a partial success with minimal skill most of the time? But needs a total of +4 to reliably get a full success?
Difficulty to hit someone is 10 + Agi + Evasion (min 10). If they parry, it's 10+Agi+Light Weapon skill. If they block, it's 10+Brawn+Shield Skill (large shields grant a bonus and can be applied vs multiple attacks per round).
Size adds to damage with Heavy Weapons and natural weapons. Subtracts from damage taken by physical attacks (but not falling). Subtracts from Acrobatics, Athletics (swimming), Evasion, Escape Artist and Stealth. Note that since a partial success gets you a 1/2 damage hit, really big creatures aren't quite so deadly unless they hit you solidly. Rats are Size 1 and mice Size 0.
Some skills are based on multiple stats and use the better of the two (like Athletics is based on Brawn/Agility). Should it be the worse of the two?
Armor subtracts from the damage from physical attacks, but also from Acrobatics, Athletics, Evasion, Escape Artist and Stealth.
Swimming wouldn't be lumped in with Athletics for humans, but all mice and rats know how to swim.
Reaction (Per-based) determines initiative.
Throwing is based on Brawn/Perception.
Charm skill instead of seduction. Charming Edge lets you roll Charm as a combat action, which normally you can't (Diplomacy/Persuasion you could, but not Charm).
If we allow specialties to be 1/2 value outside of the specialty, then there should be some Edges that get rid of that. Warrior Born: Light Weapons and Heavy Weapons are no longer specialized skills for you. Well-read: Knowledge is no longer a specialized skill for you (that might be too gross; perhaps I should use the Savage Worlds system of General Knowledge checks being Cleverness + appropriate bonus/penalty).
Heavy Weapons should parry with 10+(Brawn+HW)/2? That would make it crappy, but not necessarily worse than nothing.
Folks start with 3 Hero Points. There should be an Edge which grants 1 or 2 extra (I'm thinking 1 right now, but that might not be good enough). Should they all come back each session? 1/2 back each session?
Flaws could grant extra Hero Points instead of extra character points. Or they could help you restore a spent Hero Point whenever they cause you to be severely inconvenienced.