I've always seen your game everywhere whenever I checked some other submissions, Anyway, I finnaly tried it... it looks really nice, and I checked litterally everything :). My opinon would be to reverse the actions(jump = space x1, attack = space x2) , cause It took me some time to adapt to it...
I really love the jump animation, idk it just gives the player kind of a ninja fell which gives of like that the game is a mix of like ninja Aikido and karate, which is by the way so awesome.
I think there is a lot of room for expanding the game as well (you could add like different throwing weapons , more bossfights...).
I'm in love with this game, especially bossfights, which I thought couldn't be done with only one button, well I was so wrong, This game is freaking awesome, and you should probably continue working on it.