Chains & Chars: ChainLetterJam Edition

How To Play:

• Tap and hold on the screen to swing the ball around its closest pivot
• Tap quickly to shorten the chain and get a speed boost
• Collect all coins to beat the level

Note: This game is intended for mobile phones even though Unity doesn't technically support WebGL on mobile. A warning message will display but the game still runs fine on my iPhone.

Icon Attribution: finger by IcoMoon from the Noun Project

For a good explanation of how spring-pendulum systems work, check out this video by Steve Mould: 

(I am not associated with him in any way besides watching his videos)