Similar to some others, I couldn't reach the first extender in the 3rd level:

This is a great entry, well done!
Thank you for playing @LiauJ
Thanks for reporting the issue with a GIF, this helps a lot!
This may be caused by some non-deterministic issue in my chain physics code... 😭
I'm still unable to reproduce the issue (I tried different browsers & computers with no success), here's what I get.

It would be very helpful if you could share which browser, OS, and hardware you are using. Especially what CPU do you have?
I just found the issue: I forgot to use Delta-time specifically in the elasticity calculation. As a result, a higher FPS makes the chain less elastic. Haha🤦. Your CPU is about 2x faster than mine, so perhaps if you open several apps and games in the background, you'll be able to grab the chain extender! Haha
I'm uploading a fixed version as soon as the voting ends. Sorry for this, and thanks for helping me troubleshoot