i have never heard an undertale remix this energetic before and i absolutely love it. you deserve more attention. for speeding up, i would try to refrain from that but otherwise it sounds amazing.
The ending of the song is so sad with how you hear the final strike as well as the death sound for Undyne, up until that I honestly wanted to imagine this as a timeline where Undyne manages to beat the player, but I guess that just isn't the case. edit: I actually choose to interpret the ending is actually that Undyne's energy in this timeline has become so colossal that when you make that final hit she actually sort of reforms as an amalgamate (not the best fate for her but then the player can never get past her)
