I've been sitting here with the cheat on for ten minutes not getting a single hit because the timing for this is flat-out impossible. It has to be frame-perfect, at probably like 30fps where 27 of those frames are nothing.
Even IF I could match the right key with the right visual cue in time in my head, which I can't even come close to doing, there's just no hitting this.
Never mind making me immortal, if it was slowed to 30% speed I probably still wouldn't have a chance.
EDIT: I downloaded it, it was bugging me so bad. Holy shit, if you download it, it's actually a game, and probably not a hard one; the shuriken actually stays on screen for more than two frames.
Okay yeah, this is just one of those games that LOOKS playable from Chrome, very playable actually in this case, but it simply isn't. Dunno how that works.