You didn't fully understand the idea of the game. When you press spacebar, you detach from all the chains, and to start colliding with them, you have to stop pressing spacebar. So, you have to be partially inside of the next chain, and then stop pressing the spacebar, so that your chain and other one will connect.
Here's the link with the video, hope it will get it clear. :D
https://drive.google.com/file/d/1tcjkUSoHCvallK7iyF9FpLXj-wPQJbYq/view?usp=shari...