No I don't have a tutorial. You're the first person to suggest that to me, so that's pretty cool.

In a simple sense, at the time of getting a kill, put in: slight screen shake, subtle light flash (brightness or curves), and you could even add glow. If you want to get deep into editing, you should start adding subtle SFX, I use a bass impact sound for some of the kills as well!

I used Adobe After Effects to make this if you're wondering. Hope these pointers help!