A really fun platforming game. There were certainly some frustrating moments, many of which were related to the contextual jumping (my butterfingers just aren't that good at it though I wound up improving a lot). Most of the time trials required some clever jumping to save time (I admit for a couple having to watch the walkthrough on youtube). My proudest achievement, though, is figuring out how to get the payslip on Fire Escape (that had me pulling my hair).
I agree with NeonSpider about having everything start out stationary and pressing a button to begin running. Starting out running wouldn't be as much of a problem if you always started in the same position but you don't (so you're not sure where you should be looking when you click on the next level).
A further suggestion is about some of the secret modes. Because I haven't completed them I assume you go through the whole game again? But having tried some of them and come back to them I discovered you have to start over from the beginning each time. My suggestion would be allowing the player to start from the most current uncompleted level or have it immediately go to a level select when you click on them.