Try "Feel the Wear". You can set custom notification sounds for any app on your phone and it even has an hourly chime option. Make sure you install it on your watch and phone. I'm using it on my LG Watch Sport and it works perfectly.
I would like to win the Nexus 6P because I have never owned a Nexus device and have always bought the latest and greatest while over looking a pure Android smartphone. I would like to see what it's like to get an update within the same year it was released. I need this phone.