This game has potential.
And I'm interested to see how much potential could come out of this.
The base is there, it works, it's good, and I think that with the right materials, this could turn out to be a very good game.
I enjoy the cute and Flash-reminiscent graphics and music, they give this game personality. The right game design ideas are there, but could do with a bit more fine-tuned difficulty scaling.
However, one thing in particular which I didn't like was the camera. It's really inconvenient, especially for a platformer where you always need to be able to foresee your next actions. And with such a limiting view and low camera, it becomes hard to make consistent progress as you are unable to tell where to land or jump to.
One thing that would benefit the game is a silhouette of the objects that appear when switching dimensions. This would help the flow of the game.
Good job so far, if you could manage to fix these issues then you'll have a great little game.