This is a pretty neat game.
I'd like to make the suggestion for god's sake that you shouldn't be using the mouse click to progress with the story. If a player want to play with the arrow keys, they have to move their hand repeatedly from the keys to the mouse. I just see this a lot and it's such a common mistake with a simple fix and it bothers me. This would only be acceptable if the mouse was necessary in your game for something other than a single button input that could be replaced by a key, and in that case you should probably just disable arrow key controls so that people can't frustrate themselves by not realizing WASD are the movement controls because they tried the arrow keys first.
Also, some micro feedback would be nice. It seems to be REALLY important that the player jump at the apex of their jump, but it's hard to see the apex of your jump inside of a circle because the player gets whited out. Some sort of sound or audio cue when the player has entered one of the circles, and when the player has reached the height of their jump would be really helpful to players, because also, when you're falling into a circle, sometimes you want to press the jump button as soon as you enter it, but there's no real cue for when that happens (aside from the obvious, which isn't quite as clear).
Otherwise, I think the jumping is a little touchy. On some levels, if you don't jump on the first light circle correctly, you wont get enough height down the line to reach the 4th or 5th circle, and it's annoying to slowly realize that as you're jumping before you lose. I figured that's the only thing that makes the game challenging though, besides avoiding the circular saws, so i don't think it's that bad. The problem with it lies in what I said above: It's hard to know when to jump because of a lack of feedback.