A very nice platformer. I liked the fact that the traps were well signaled by the placement of the coins and the overall nature of the traps felt friendly rather than antagonistic!
A couple of potential comments: 1) It would be nice to include some flexibility for players by making it slightly easier to avoid traps and easier to land on platforms (roadrunner time, etc.); 2) I found the movement speed and responsiveness to be a bit slow when controlling the character.
Other than that, great work!