I really didn't think that the mix of puzzle/platforming will confuse me. But after I solved level by platforming I felt like I cheated the level, I felt like there was a "puzzle" solution but I didn't find it.
Otherwise the games seems pretty solid to me (much more than I expected for a demo). I had a little problem with the hub, I didn't get that I have to throw the magnet into the tube (nothing that simple tutorial wouldn't solve). Level 6 was significantly more difficult for me than the other ones. Level 6 was the only one that required thinking/solving, the other ones came pretty naturally without much thinking.
The jump height is sometimes just shy of the step I want to get onto. It's pretty annoying because I had go back, drive towards the step and then jump. This happened even with some steps that weren't part of the solution. Like I wanted only to get from A to B to solve the level.
I really like the throwing with E, because the game is playable even with trackpad. I am way too lazy to get the mouse for simple games like this.