The game will not win a beauty competition but the game design and level design is excellent.
The idea is simple at first but you really develop it really well with an excellent level design. It is a bit difficult sometimes to navigate between the platforming with the keyboard and the platform positioning with the mouse but having slow down remove a lot of the frustration and it looks pretty cool.
At first I thought I had to grab the platform before putting it but I realised later that you can just click anywhere to slow down time. I think it makes the game much more enjoyable.
Did I say already that the level design is good? Because it's really good. :) The progression between level is really nicely done with new interesting mechanic being introduced each time. And the difficulty is I think really well balanced.
That game really impressed me. Congratulations :)