This is a cover/remake/remix(interpret how do you want) of a music called "Tiny Beat", of Nansukezita.
all the credits of the music goes to her.
original: https://www.ptweb.me/play/DjQt

I was like, "Hey this melody sounds familiar-" and then I get slapped by Megalovania at 100 mph out of nowhere.
Interesting. I wonder what the context is...