I like the idea. But the levels are more towards him being out of the box than in. I would make him bouncing to move the main focus and the levels not so open.
Great job, Keep it up
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I did love the momentumness of the controls. I think a tighter level will compliment that more like if you have a long rectangle stretch of road leading up to a large gap the player is encourage to gain speed to make the jump. While if you had a large square road the player is encouraged to explore slowly.
I do like giving the player room to explore but I just found it easier to not be in the box to do so. Look up the game Pilfer: Story of Light. It also has momentumness to it and especially with the bonus levels, thats the kind of level I am talking about.