Here is my 100% Achievement guide for Hardcube!
As you go through each level you see small red buttons on the ground.
These are actually mines and when you hit it, it explodes and depending on where you hit it, it can either knock you off the level and you have to retry it again, or it moves you a tiny bit.
You can do this several times over in the game, just make sure your next to high walls that can help you not fall off.
Either way its much easier than it sounds and you can see where i do it on level 1-5 at 6:10
Hope This Helps!