This was fun, but short. I wish it would include more choices and the algorithm by which your skill points aid the rolling would be made clearer. Right now I have doubts whether or not skills matter mach, I lost 2 times in final mission because I failed to roll Infiltration 3 times in row despite it being maxed out.
Assuming skills help my recommended strategy would be:
Infiltration - used very often, the game even says it is most useful skill - max it! 10points!
Athletics - often used together with infiltration - 5 points.
Combat/Guns/Sniper - make one of these your primary (8 or 7 points) and another your secondary (2 or 3 points), then choose what you do best when choice is presented. Total -10 points. I think sniper is slightly superior then others because it may not require an additional infiltration roll to get away from the scene.
Explosives/Electronics/Mechanics - make one of these your primary (8 or 7 points) and another your secondary (2 or 3 points), then choose what you do best when choice is presented. Total -10 points. I think Electronics is slightly superior then others because it makes all rolls easier on mission 6 by destroying cameras.
That is the starting 35 points in total.
After that between levels upgrade perception to 5 points then whatever you want.