Well done on submitting, this is a good effort! I found the controls to feel a bit floaty and unresponsive at times, which isn't ideal for a speed running platformer. The music was a nice touch which I enjoyed. I really liked your idea with the power ups, the speed one added that fast paced feeling which I wanted and would have liked to see more of those. The collection of the coins was a good way to give direction, however the levels all took place on the same plane and I think adding some more variation in the vertical plane, and maybe a change in direction (going left to right), would make the levels feel more interesting. Overall, nice job and good luck on your next project!