If you hold sprint while interacting with a block you will pull it, in the most recent version I've added prompts to the game so you can see those as options before you push/pull
There was a problem in older Android version where pulling the block didn't work great. You can try pressing Sprint and Interact at the same time or one right after the other, but it isn't very intuitive. In the most recent version (0.25.1) I just made the Block command pull the blocks.
