I think the rolling is nice. Controls well. Don't know much about the visual art but I like the shapes, the lighting, the colors and all seems to fit together well. I think the in game music is nice and fits the theme. The boost pad sound sounds nice and makes the character feel like its heavy/made of metal.
Feedback..
1. I think some more sounds/sound programming would be a great addition, specifically..
.. a rolling sound
.. walking sounds matching the material being walked on (the sand sounds exactly like the stone)
.. the pace of walking in the sound seems to be out of sync with the walking animation
.. landing and jumping sounds
.. ambient sound(s) (I think ambient sound would make the music less straining to listen to if the music isn't the only background sound)
2. The jumping sometimes didn't trigger, which was especially noticeable right before a cliff where, even though it looked like I had some distance left till the cliff, jumping didn't happen.
3. The 15/6 log says there's a ending to the conclusion level. I couldn't reach the end of the 3rd level (the one without any art). In the square tower there's a floating checkpoint and floating boost pads but no platforms to stand.
4. Though the 3rd level is a mockup, the very large scaled boost pad was confusing as it appeared closer and smaller than it actually was and thus made estimating when to press ground pound not intuitive.
5. I thought the coins were distracting. Collecting them all isn't possible in every level and each coin plays a very loud sound both both of which made them feel more a distraction than fun. It's also not clear to me how they fit the theme and why to pick them up at all.