Really nice graphics by Pixel frog, quite good music and incredibly frustrating gameplay.
But! As a guy who played a lot of platformers and made a fair bit of them myself, I can say:
1) The controls are pretty bad and irresponsive, took me a while to get at least a bit familiar with them
2) Physics is a bit wierd, especially the strong gravity and bouncing... It's is just over the top. It happens that you walk into a spike, which forces you onto a saw, which bounces you high up
So, in pair with controls it makes death seem unfair and frustrating.
3) No checkpoints at all. Seriously? I mean, I know you're trying to turn 5 minutes of gameplay into 20+, but quality>quantity. It made every death even more frustrating.
All these things compared make for a great rage game, but I'm not sure it's the thing you wanted to make.
Really frustrating experience. Hope you won't make such mistakes in future :)