The start is a bit hard if you don't know what todo
But then I like it :)
Maybe let the kunai fly down faster a bit :)

Not bad, but I would suggest to make the first few ninjas "climb" slower so you can understand better what's going on and let the "eye" adapt to the speed.

My Finale score was: 137 and I played using all three control types

This game looks very cute and runs pretty smooth so theirs really no hiccups except occasionally whilst playing with the arrow keys instead of the mouse or touchscreen.

Functionally theirs nothing I have problems with.... though due to the repetitive nature of the game I really don't feel the need to keep playing it..

The only recommendations I can really make to you are #1. please add a simple soundtrack or two for while your actively playing the game. #2 Please add a leader board, for a game like this if you want people to keep playing it you have to give them a purpose... and if I can't see the kind of scores other players are getting I don't really feel any sort of accomplishment.

Overall, I do like your game it just feels kind of lackluster. Keep up the good work buddy :)
If you keep trying you'll keep improving