When I first read about this I thought it all sounded a bit gimmicky and geeky, but it's actually not. As the Flutter website suggests, there are times when being able to play and pause your music via a hand gesture is handy. e.g. when you have many windows open. With just a wave of the hand in the air you can pause or start playback, regardless of what you're working with on-screen at the time. Truly handier in practise than it may sound.
Before checking the app out myself I wanted to read more about it or see a quick demo on YouTube. Then I realised the app is free and very quick to download. Within a minute I was using it and posting this!
One thing I'm sure will be on the developers' minds already - it brings a "touchscreen" like experience to controlling your audio and you naturally want to be able to swipe your hand left or right to skip tracks, maybe even shake your hand to shuffle tracks. Perhaps in future you could just throw up a maloik and immediate hear a metal track... the sky's the limit with this one.
I'm enjoying it and look forward to seeing it developed further. Hope you enjoy too.