Ninja Run - Decent, but needs some redesign
Not a bad attempt at twisting the Canabalt formula, but as Trimaster7 said below, the shooting mechanics becomes unnecessary with the Stone Skin capability.
One thing that puts it below Canabalt is the lack of speed, though. The platforms are mostly small, which kinda limits your freedom. You can't just sprint through the game because doing so would cause you to drop into a pit. The player then ends up being forced to slow down, which really hinders the sense of speed which made Canabalt so much fun to play.
Perhaps longer platforms can be used? They would allow a player to sprint, and give him time to judge the next jump without the need to slow down.
Apart from that, maybe do something about the redundancy of the enemies when you have Stone Skin on, and an indicator about the swinging ability as stated by Sketchyboy2000.
All in all, decent effort, but it could use some more thought.