Hi mixmax, that's unfortunately true. If the distance between you and an empty space is small enough when uniting the cubes while standing in a phased out environment, the cubes will be pushed to the empty space. I can imagine two ways to solve the issue when getting stuck in the environment though. The nicer solution woul be a check and only allow uniting when not standing deep in a phased out environment - or - load the game over state when being stuck. I hope you still enjoyed the other parts while playing. Have a nice day & thanks for your comment!