This idea has potential, I liked it.
But some things I didn't:
- There was a lot of camera effects that don't needed and don't actually made sense to your game aesthetics;
- The music was repetitive, but for a game jam, is what we have;
- The ledge grab mechanic makes sense for a ninja game, but it was too tight;
- Mouse to control your attack would be better if you threw a shuriken or something... Just for a regular slash, any key would work better.
Anyway good job!