The game is quite decent, and I love that you can move the cube around with a draggable one to try to make your way through the levels. Oh and the level design was great too, although maybe just a *tad* bit too difficult. And this is why I got stuck at level 4 (the level where you have to launch the cube to the other side).
What I would have changed though is make the movable cube's size a little bigger, so that the difficulty wouldn't be too radical for the player to take in. The fact that it's quite small fits the theme though, and maybe making it bigger would make the "accuracy" not as "insane". It's a nice idea though, and you've done a great job of making it into a playable experience!