The puzzle design is awesome.
The controls had a delay/animation time which made me a little bit frustrated, because I knew everything I have to do, but it took longer because of that.
The doors could have a sound effect attached to them opening, I didn't notice the doors opened in the first level. Also I was confused at first because the "Step on button to start" prompt is there all the time, and I thought something was bugged because I didn't see the door opening.
The presentation is very nice :)