A catchy aesthetic and fun concept but it does have a few areas to improve. It should be made clear in the controls that you use right CTRL + Arrows as I have seen some others claim it didn't work. Secondly, I found it a bit hard to know when I was moving or selecting the blocks - perhaps just make the lines a bit thicker or had some shadow to elevate the blocks away from the track. Finally, I managed to make the cat ride one block a good distance before having to move to a different block, maybe make it disable moving blocks you're standing on. With some more work this could have some real potential!