I am seriously praying you will be able to play the original themes in Resident Evil 4 remakes mercenaries mode, because it’s criminal to not include all the original themes, they are too good and give the game so much personality and heart.
I was recently trying to find it out too, and it seems to me that is "Jungle DnB". I can assure you, if you like soundtracks like this one just like me, you will like that genre too. Describing this genre with my words, I can say that it is almost like that Ada one, a quick and frenetic beat, like breakcore, but with harmonic melodies and bass on it to give it a cool vibe.