My rating system is based on the number of stars I gave divided by two. I gave 16 stars in my rating. (4 in each category). It would be difficult to make a 10/10 game, as it would have to perfectly satisfy all criteria.
My rating on the stars is thus:
1 star, complete failure in this particular regard. (I haven't given any 1 stars yet)
2 star, mostly failed in this department but there are some positives.
3 star, in the middle, where I have no preference one way or the other.
4 star, very satisfactory, but just missing that tiny push that would make it reach 5 stars
5 star, absolutely perfect in this area.
I do not know what would raise the score for me. you should just make what you feel (as long as it's in the guidelines) and you will eventually find a way.
Here is some criticism: The enemy health is a bit too high, most of the game is pretty good so I'm not sure what to say as there aren't any glaring issues so most of what I dislike is just my opinion (ie: using the mouse, it being a shooter, etc.)