Cheers for the feedback and kind words!
Good idea with the radar displaying ammo packets, will for sure add that in. The UI is supposed to only shake when you're hit, but there does need to be some stronger indicator. I might add some red line flashes or have the whole UI turn red to indicate that better.
I too prefer the Brigador-style of missions with fixed objectives; both missions do have a limited enemy count and once you neutralize all targets it should conclude and tally up the score (hopefully)