I really like this one. The controls/changes in feel when removing blocks made this a bit of a tricky one to play at points but I LOVED the idea :D I thought this was an awesome concept and made for such a good puzzle game!
Needing to choose which blocks to remove to make sure you could still rotate and climb stairs etc was very clever and the dropping cubes onto platforms for doors etc was done really nicely
I had some trouble with the cube rotating into midair and suddenly swapping whether QE/AD moved it left/right or right/left and sometimes I didn't seem to be able to move the player (getting stuck next to a detached block or unable to go uphill) but aside from the minor issues with the movement/control aspect I think this is really cool.
Amazing idea that this demonstrates really well and could definitely be made into a full game (that I would totally play) - Really good job :)