Actually this sounds like a remix to some of the story events in Ninja Gaiden 3 (Great Game btw, hard though).
Personally I loved the music in that game and this is a nice version of it. I know you mixed it for Sprite Survivor, maybe you made it without even realizing it sounds like a full on remix of Ninja Gaiden 3 or maybe that was just coincidence.
Onto the piece itself. Great loop, you don't even know where the end of the song is unless you watch the bar, I also loved the use of what sounds like Violas or Cellos in there and the piano is brilliant.
very eazly loopable
Please contact me if you would like to use this in a project. We can discuss the details.