Really simple. I could see this being pretty good with some polish though.

Nice and simple. The swing animation reminds of Ninja Kage, one of my favorite game in famicom. The graphics are nicely drawn with the right color theme that fits the game atmosphere. Good job.

Good game.

Cool game. The endless runner is basically the spirit guardian of flash games (T-Rex Chrome Dino Game, I'm looking at you). 

I like the ninja context, it makes for a fun game world I think.

Well done, thanks for the game :-)

Nice game! The gameplay is is simple and fun. I like it dattebayo XD!