Interesting take on a platformer game! For your first time, this is a great submission. I enjoyed this game. Music was really interesting. I had some trouble when killing enemies - it always said left click and I always tried to do that (all over the screen) when I hit them three times, but it never did anything. Not sure if it's a bug or what.
As a side note, it looks like the GitHub URL provided is empty - may want to include your code. :)