Custom Die Combat Mechanic

I thought I'd share an interesting dice combat resolution method that has worked its way into a couple of my games.
It has so far been a successful method, and one that has a number of benefits.

First off, the goal was to reduce overall complexity while retaining interesting effects, and an element of variation, and the ability to easily modify the outcome probability.

This uses a single custom 6-sided die.
The faces have custom symbols, but simply relate to the sides as follows:
1) Miss
2) Miss / Accuracy (Miss, unless attacker has accuracy trait, then hit)
3) Hit / Evade (Hit, unless target has evade trait, then miss)
4) Hit / Damage (Hit, unless attacker has damage trait, then +1 damage)
5) Major Hit (+1 damage)
6) Major Hit / Critical (+1 damage, critical effect)

See the attachment for an image that shows the face graphics.

Each weapon has a listed amount of damage, then the hit and damage roll is combined.
There is a basic 2/3 chance of hitting your target, and then is some element of varied damage as 2 faces provide and extra point of damage.
To reflect that some weapons are more accurate, some targets harder to hit, etc. The following traits can be attached to various entities, weapons, or abilities:

Accuracy: Increases hit chance by 17%
Evade: Increases miss chance by 17%
Damage: Increases the chance of an extra point of damage by 17% (This is useful to create a more powerful weapon without having to increase its base damage, letting you keep damage values lower and simpler)

Critical: Special critical effects can be attached to weapons, items, abilities, etc. When a crit is rolled, the player gets to pick one eligible effect and use it with the attack. This can be additional damage, or some other fun effect. These add an interesting element but one that can't be predicted reliably.

For example:
One game is space opera in theme. I was able to move away from a standard method of rolling a d10 and adding the weapon score and trying to beat the target's defense score. Smaller ships had higher defense scores to make them harder to hit, while larger ships had more hit points. It wasn't bad, but tended to get a bit numbery.

With the new system, things got easier. The smaller ships instead got the Evade trait to make them harder to hit, while the large ships basically got an "every weapon vs. this has Accuracy" trait.
Beam weapons tended to get Accuracy. Missiles tended to get Damage/and or Accuracy.
Critical effects were things like: Ignore armor, drain 2 energy, choose the location of 1 damage, etc. and usually were attached to the individual weapons.

Basically, the system is quicker and more intuitive, yet retaines the variability, and even added interesting "once in a while" effects.