Tachycardia is really good! The fast electric piano and the acceleration at the end totally express the guilt and panic stroke caused by the revelation the character has. I could feel the madness and fear while realising the path "I" (the protagonist) took with that first kill, and therefore, the terrific road before me.
Very interesting idea and engaging concept for a game btw..
The other two tracks are interesting, Tachycardia is definitely my favorite between the three! Great job :)